Investing in our common stock involves a high degree of risk. You should carefully consider the risks described below as well as the other information contained in this prospectus, including our consolidated financial statements and the related notes, before deciding to purchase any shares of our common stock. The occurrence of any of the following risks could harm our business, prospects, financial condition or operating results. In that case, the trading price of our common stock could decline and you may lose part or all of your investment.

Our company has only been in existence since 2001. A significant amount of our growth, in terms of employees, operations and revenue, has occurred since 2004. For example, our revenue has grown from $5.0 million in 2003 to $64.3 million in 2006. As a consequence, we have a limited operating history which makes it difficult to evaluate our business and our future prospects. We have encountered and will continue to encounter risks and difficulties frequently experienced by growing companies in rapidly changing industries, such as the risks described in this prospectus. If we do not address these risks successfully, our business will be harmed.

We have recently expanded our operations significantly, increasing our total number of employees from 29 at December 31, 2004 to 168 at April 30, 2007, and we anticipate that further significant expansion will be required. Our future operating results depend to a large extent on our ability to manage this expansion and growth successfully. Risks that we face in undertaking this expansion include: training new sales personnel to become productive and generate revenue; forecasting revenue; controlling expenses and investments in anticipation of expanded operations; implementing and enhancing our content delivery network, or CDN, and administrative infrastructure, systems and processes; addressing new markets; and expanding international operations. A failure to manage our growth effectively could materially and adversely affect our ability to market and sell our products and services.

In June 2006, Akamai Technologies, Inc., or Akamai, and the Massachusetts Institute of Technology, or MIT, filed a lawsuit against us in the U.S. District Court for the District of Massachusetts alleging that we are infringing two patents assigned to MIT and exclusively licensed by MIT to Akamai. In September 2006, Akamai and MIT expanded their claims to assert infringement of a third, recently issued patent. These two matters have been consolidated by the Court. In addition to monetary relief, including treble damages, interest, fees and costs, the consolidated complaint seeks an order permanently enjoining us from conducting our business in a manner that infringes the relevant patents. A permanent injunction could prevent us from operating our CDN altogether. The Court held a claims construction hearing, known as a Markman hearing, on May 17, 2007. We do not anticipate that we will receive a ruling on this hearing before mid-June 2007, and the ruling may come much later. Although the Court has not set a trial date, based on the schedule currently in place, we believe it is likely that the case will go to trial in 2008.

Akamai and MIT have asserted some of the patents at issue in the current litigation in two previous lawsuits against different defendants. Both cases were filed in the same district court as the

current action, and assigned to the same judge currently presiding over the lawsuit filed against us. In one case, Akamai prevailed in part after a jury trial, securing an injunction against the defendant on four claims of the asserted patent. The appeals court upheld the injunction, though it held that two of the four claims of the challenged patent were invalid. Neither lawsuit resulted in settlement or in the issuance of a license to the defendant before the trial. In addition, the second lawsuit ended only when Akamai acquired the defendant prior to final resolution of the case.

While we believe that the claims of infringement asserted against us by Akamai and MIT in the present litigation are without merit and intend to vigorously defend the action, we cannot assure you that this lawsuit ultimately will be resolved in our favor. An adverse ruling could seriously impact our ability to conduct our business and to offer our products and services to our customers. This, in turn, would harm our revenue, market share, reputation, liquidity and overall financial position. Whether or not we prevail in our litigation, we expect that the litigation will continue to be expensive, time-consuming and a distraction to our management in operating our business.

We compete in markets that are intensely competitive, rapidly changing and characterized by vendors offering a wide range of content delivery solutions. We have experienced and expect to continue to experience increased competition. Many of our current competitors, as well as a number of our potential competitors, have longer operating histories, greater name recognition, broader customer relationships and industry alliances and substantially greater financial, technical and marketing resources than we do. Our primary competitors include content delivery service providers such as Akamai, Level 3 Communications (which recently acquired Digital Island, SAVVIS Communications’ content delivery network services business) and Internap Network Services Corporation (which recently acquired VitalStream). Also, as a result of the growth of the content delivery market, a number of companies are currently attempting to enter our market, either directly or indirectly, some of which may become significant competitors in the future. Our competitors may be able to respond more quickly than we can to new or emerging technologies and changes in customer requirements. Some of our current or potential competitors may bundle their offerings with other services, software or hardware in a manner that may discourage content providers from purchasing the services that we offer. In addition, as we expand internationally, we face different market characteristics and competition with local content delivery service providers, many of which are very well positioned within their local markets. Increased competition could result in price reductions and revenue shortfalls, loss of customers and loss of market share, which could harm our business, financial condition and results of operations.

Our customers and potential customers may decide to develop their own content delivery solutions rather than outsource these solutions to CDN services providers like us. This is particularly true as our customers increase their operations and begin expending greater resources on delivering their content using third-party solutions. For example, MusicMatch was our most significant customer in 2004 and one of our top 10 customers in 2005, but following its acquisition by Yahoo! Inc., MusicMatch’s content delivery requirements were in-sourced and it was not a customer of ours at all in 2006. If we fail to offer CDN services that are competitive to in-sourced solutions, we may lose additional customers or fail to attract customers that may consider pursuing this in-sourced approach, and our business and financial results would suffer.

Customers or third parties may develop technological or business model innovations that address content delivery requirements in a manner that is, or is perceived to be, equivalent or superior to our CDN services. If competitors introduce new products or services that compete with or surpass

the quality or the price/performance of our services, we may be unable to renew our agreements with existing customers or attract new customers at the prices and levels that allow us to generate attractive rates of return on our investment. For example, one or more third parties might develop improvements to current peer-to-peer technology, which is a technology that relies upon the computing power and bandwidth of its participants, such that this technological approach is better able to deliver content in a way that is competitive to our CDN services, or even that makes CDN services obsolete. We may not anticipate such developments and may be unable to adequately compete with these potential solutions. In addition, our customers’ business models may change in ways that we do not anticipate and these changes could reduce or eliminate our customers’ needs for CDN services. If this occurred, we could lose customers or potential customers, and our business and financial results would suffer. As a result of these or similar potential developments, in the future it is possible that competitive dynamics in our market may require us to reduce our prices, which could harm our revenue, gross margin and operating results.

Prices for content delivery services have fallen in recent years and are likely to fall further in the future. Recently, we have invested significant amounts in purchasing capital equipment to increase the capacity of our content delivery services. For example, in 2006 we made $40.6 million in capital expenditures, primarily for computer equipment associated with the build-out and expansion of our CDN. Our investments in our infrastructure are based upon our assumptions regarding future demand and also prices that we will be able to charge for our services. These assumptions may prove to be wrong. If the price that we are able to charge customers to deliver their content falls to a greater extent than we anticipate, if we over-estimate future demand for our services or if our costs to deliver our services do not fall commensurate with any future price declines, we may not be able to achieve acceptable rates of return on our infrastructure investments and our gross profit and results of operations may suffer dramatically.

In addition, in 2007 and beyond, we expect to increase our expenses, in absolute dollars, in substantially all areas of our business, including sales and marketing, general and administrative, and research and development. In 2007 and 2008, as we further expand our CDN, we also expect our capital expenditures to be generally consistent with the high level of expenditures we made in this area in 2006. As a consequence, we are dependent on significant future growth in demand for our services to provide the necessary gross profit to pay these additional expenses. If we fail to generate significant additional demand for our services, our results of operations will suffer and we may fail to achieve planned or expected financial results. There are numerous factors that could, alone or in combination with other factors, impede our ability to increase revenue, moderate expenses or maintain gross margins, including:

The market for our CDN services is characterized by rapidly changing technology, evolving industry standards and new product and service introductions. Our operating results depend on our ability to develop and introduce new services into existing and emerging markets. The process of developing new technologies is complex and uncertain. We must commit significant resources to developing new services or enhancements to our existing services before knowing whether our investments will result in services the market will accept. For example, we recently introduced our Geo-Compliance paid service option, and we do not yet know whether our customers will adopt this offering in sufficient numbers to justify our development costs. Furthermore, we may not execute successfully our technology initiatives because of errors in planning or timing, technical hurdles that we fail to overcome in a timely fashion, misunderstandings about market demand or a lack of appropriate resources. Failures in execution or market acceptance of new services we introduce could result in competitors providing those solutions before we do, which could lead to loss of market share, revenue and earnings.

During any given fiscal period, a relatively small number of customers typically accounts for a significant percentage of our revenue. For example, in 2006, revenue generated by sales to our top 10 customers, in terms of revenue, accounted for approximately 54% of our total revenue for the same period. One of these top 10 customers, CDN Consulting, which acted as a reseller of our services primarily to MySpace.com, represented in excess of 21% of our total revenue for that period. In the quarter ended March 31, 2007, sales to this reseller declined to approximately 2% of our revenue, and prospectively, we do not expect sales to this reseller to be at levels comparable to those achieved in 2006. In the past, the customers that comprised our top 10 customers have continually changed, and we also have experienced significant fluctuations in our individual customers’ usage of our services. For example, one of our top 10 customers in 2005 was no longer a customer at all in 2006. In addition, our operating costs are relatively fixed in the near term. As a consequence, we may not be able to adjust our expenses in the short term to address the unanticipated loss of a large customer during any particular period. As such, we may experience significant, unanticipated fluctuations in our operating results which may cause us to not meet our expectations or those of stock market analysts, which could cause our stock price to decline.

In addition to adding new customers, to increase our revenue, we must sell additional services to existing customers and encourage existing customers to increase their usage levels. If our existing and prospective customers do not perceive our services to be of sufficiently high value and quality, we may not be able to retain our current customers or attract new customers. We sell our services pursuant to service agreements that are generally one to three years in length. Our customers have no obligation to renew their contracts for our services after the expiration of their initial commitment period, and these service agreements may not be renewed at the same or higher level of service, if at all. Moreover, under some circumstances, some of our customers have the right to cancel their service agreements prior to the expiration of the terms of their agreements. Because of our limited operating history, we have limited historical data with respect to rates of customer service agreement renewals.

This fact, in addition to the changing competitive landscape in our market, means that we cannot accurately predict future customer renewal rates. Our customers’ renewal rates may decline or fluctuate as a result of a number of factors, including:

If our customers do not renew their service agreements with us or if they renew on less favorable terms, our revenue may decline and our business will suffer. Similarly, our customer agreements often provide for minimum commitments that are often significantly below our customers’ historical usage levels. Consequently, even if we have agreements with our customers to use our services, these customers could significantly curtail their usage without incurring any penalties under our agreements. In this event, our revenue would be lower than expected and our operating results could suffer.

It also is an important component of our growth strategy to market our CDN services to industries, such as enterprise and the government. As an organization, we do not have significant experience in selling our services into these markets. We have only recently begun a number of these initiatives, and our ability to successfully sell our services into these markets to a meaningful extent remains unproven. If we are unsuccessful in such efforts, our business, financial condition and results of operations could suffer.

Our results of operations may fluctuate as a result of a variety of factors, many of which are outside of our control. If our results of operations fall below the expectations of securities analysts or investors, the price of our common stock could decline substantially. Fluctuations in our results of operations may be due to a number of factors, including:

We believe that our revenue and results of operations may vary significantly in the future and that period-to-period comparisons of our operating results may not be meaningful. You should not rely on the results of one period as an indication of future performance.

Our recent adoption of SFAS 123R for 2006 has substantially increased the amount of stock-based compensation we record and has had a significant impact on our results of operations. After being profitable in 2004 and 2005, we became unprofitable in 2006 primarily due to this increase in stock-based compensation expense, which increased from $0.1 million in 2005 to $9.1 million in 2006. This increase reflects an increase in the amount of option and restricted stock grants made in 2006 coupled with a reassessment of fair value of grants in 2006 resulting in a determination that the grants were below fair value at the grant date. Our unrecognized stock-based compensation totaled $29.1 million at March 31, 2007, of which we expect to amortize $10.6 million over the final three quarters of 2007, $8.7 million in 2008 and the remainder thereafter based upon the scheduled vesting of the options outstanding at that time. We further expect our stock-based compensation expense to increase in 2007 and potentially to increase thereafter as we grant additional options or restricted stock awards. The increased stock-based compensation expense could adversely affect our ability to achieve and maintain profitability in the future.

While we offer our customers a number of services associated with our CDN, we generated nearly 100% of our revenue in 2006 from charging our customers for the content delivered on their behalf through our CDN. As we do not currently have other meaningful sources of revenue, we are subject to an elevated risk of reduced demand for these services. Furthermore, if the market for delivery of rich media content in particular does not continue to grow as we expect or grows more slowly, then we may fail to achieve a return on the significant investment we are making to prepare for this growth. Our success, therefore, depends on the continued and increasing reliance on the Internet for delivery of media content and our ability to cost-effectively deliver these services. Factors that may have a general tendency to limit or reduce the number of users relying on the Internet for media content or the number of providers making this content available online include a general decline in Internet usage, litigation involving our customers and third-party restrictions on online content, including copyright restrictions, digital rights management and restrictions in certain geographic regions, as well as a significant increase in the quality or fidelity of offline media content beyond that available online to the point where users prefer the offline experience. The influence of any of these factors may cause our current or potential customers to reduce their spending on CDN services, which would seriously harm our operating results and financial condition.

Because the proliferation of broadband Internet connections and the subsequent monetization of content libraries for distribution to Internet users are relatively recent phenomena, many of our

customers’ business models that center on the delivery of rich media and other content to users remain unproven. For example, social media companies have been among our top recent customers and are pursuing emerging strategies for monetizing the user content and traffic on their web sites. Our customers will not continue to purchase our CDN services if their investment in providing access to the media stored on or deliverable through our CDN does not generate a sufficient return on their investment. A reduction in spending on CDN services by our current or potential customers would seriously harm our operating results and financial condition.

Companies, organizations or individuals, including our competitors, may hold or obtain patents or other proprietary rights that would prevent, limit or interfere with our ability to make, use or sell our services or develop new services, which could make it more difficult for us to operate our business. From time to time, we may receive inquiries from holders of patents inquiring whether we infringe their proprietary rights. Companies holding Internet-related patents or other intellectual property rights are increasingly bringing suits alleging infringement of such rights or otherwise asserting their rights and seeking licenses. For example, in June 2006, we were sued by Akamai and MIT alleging we infringed patents licensed to Akamai. Any litigation or claims, whether or not valid, could result in substantial costs and diversion of resources. In addition, if we are determined to have infringed upon a third party’s intellectual property rights, we may be required to do one or more of the following:

If we are forced to take any of these actions, our business may be seriously harmed. In the event of a successful claim of infringement against us and our failure or inability to obtain a license to the infringed technology, our business and operating results could be harmed.

We rely on a combination of patent, copyright, trademark and trade secret laws and restrictions on disclosure to protect our intellectual property rights. These legal protections afford only limited protection, and we have no currently issued patents. Monitoring infringement of our intellectual property rights is difficult, and we cannot be certain that the steps we have taken will prevent unauthorized use of our intellectual property rights. We have applied for patent protection in a number of foreign countries, but the laws in these jurisdictions may not protect our proprietary rights as fully as in the United States. Furthermore, we cannot be certain that any pending or future patent applications will be granted, that any future patent will not be challenged, invalidated or circumvented, or that rights granted under any patent that may be issued will provide competitive advantages to us.

Our business is dependent on providing our customers with fast, efficient and reliable distribution of application and content delivery services over the Internet. Many of our customers depend primarily or exclusively on our services to operate their businesses. Consequently, any disruption of our services could have a material impact on our customers’ businesses. Our network or services could be disrupted by numerous events, including natural disasters, failure or refusal of our third-party

network providers to provide the necessary capacity, failure of our software or CDN delivery infrastructure and power losses. In addition, we deploy our servers in approximately 50 third-party co-location facilities, and these third-party co-location providers could experience system outages or other disruptions that could constrain our ability to deliver our services. We may also experience disruptions caused by software viruses or other attacks by unauthorized users.

While we have not experienced any significant, unplanned disruption of our services to date, our CDN may fail in the future. Despite our significant infrastructure investments, we may have insufficient communications and server capacity to address these or other disruptions, which could result in interruptions in our services. Any widespread interruption of the functioning of our CDN and related services for any reason would reduce our revenue and could harm our business and financial results. If such a widespread interruption occurred or if we failed to deliver content to users as expected during a high-profile media event, game release or other well-publicized circumstance, our reputation could be damaged severely. Moreover, any disruptions could undermine confidence in our services and cause us to lose customers or make it more difficult to attract new ones, either of which could harm our business and results of operations.

Our CDN services are highly complex and are designed to be deployed in and across numerous large and complex networks. Our network infrastructure has to perform well and be reliable for us to be successful. The greater the user traffic and the greater the complexity of our products and services, the more resources we will need to invest in additional infrastructure and support. We have spent and expect to continue to spend substantial amounts on the purchase and lease of equipment and data centers and the upgrade of our technology and network infrastructure to handle increased traffic over our network and to roll out new products and services. This expansion is expensive and complex and could result in inefficiencies, operational failures or defects in our network and related software. If we do not expand successfully, or if we experience inefficiencies and operational failures, the quality of our products and services and user experience could decline. From time to time, we have needed to correct errors and defects in our software or in other aspects of our CDN. In the future, there may be additional errors and defects that may harm our ability to deliver our services, including errors and defects originating with third party networks or software on which we rely. These occurrences could damage our reputation and lead us to lose current and potential customers. We must continuously upgrade our infrastructure in order to keep pace with our customers’ evolving demands. Cost increases or the failure to accommodate increased traffic or these evolving business demands without disruption could harm our operating results and financial condition.

We lease private line capacity for our backbone from a third party provider, Global Crossing Ltd. Our contracts for private line capacity with Global Crossing generally have terms of three years. The communications capacity we have leased may become unavailable for a variety of reasons, such as physical interruption, technical difficulties, contractual disputes, or the financial health of our third party provider. As it would be time consuming and expensive to identify and obtain alternative third-party connectivity, we are dependent on Global Crossing in the near term. Additionally, as we grow, we anticipate requiring greater private line capacity than we currently have in place. If we are unable to obtain such capacity on terms commercially acceptable to us or at all, our business and financial results would suffer. We may not be able to deploy on a timely basis enough network capacity to meet the needs of our customer base or effectively manage demand for our services.

Our content delivery services depend on our ability to access certain end-user access networks in order to complete the delivery of rich media and other online content to end-users. Some operators of these networks may take measures, such as the deployment of a variety of filters, that could degrade, disrupt or increase the cost of our or our customers’ access to certain of these end-user access networks by restricting or prohibiting the use of their networks to support or facilitate our services, or by charging increased fees to us, our customers or end-users in connection with our services. This or other types of interference could result in a loss of existing customers, increased costs and impairment of our ability to attract new customers, thereby harming our revenue and growth.

In addition, the performance of our infrastructure depends in part on the direct connection of our CDN to a large number of end-user access networks, known as peering, which we achieve through mutually beneficial cooperation with these networks. If in the future a significant percentage of these network operators elected to no longer peer with our CDN, the performance of our infrastructure could be diminished and our business could suffer.

Our business depends on our ability to deliver media content in all major formats. If our legal right or technical ability to store and deliver content in one or more popular proprietary content formats, such as Adobe Flash or Windows Media, was limited, our ability to serve our customers in these formats would be impaired and the demand for our content delivery services would decline by customers using these formats. Owners of propriety content formats may be able to block, restrict or impose fees or other costs on our use of such formats, which could lead to additional expenses for us and for our customers, or which could prevent our delivery of this type of content altogether. Such interference could result in a loss of existing customers, increased costs and impairment of our ability to attract new customers, which would harm our revenue, operating results and growth.

Our future success depends upon the continued services of our executive officers and other key technology, sales, marketing and support personnel who have critical industry experience and relationships that they rely on in implementing our business plan. In particular, we are dependent on the services of our Chief Executive Officer, Jeffrey W. Lunsford and also our Chief Technical Officer, Nathan F. Raciborski. Neither of these officers nor any of our other key employees is bound by an employment agreement for any specific term. In addition, we do not have “key person” life insurance policies covering any of our officers or other key employees, and we therefore have no way of mitigating our financial loss were we to lose their services. There is increasing competition for talented individuals with the specialized knowledge to deliver content delivery services and this competition affects both our ability to retain key employees and hire new ones. The loss of the services of any of our key employees could disrupt our operations, delay the development and introduction of our services, and negatively impact our ability to sell our services.

Three members of our senior management team, our President and Chief Executive Officer, Jeffrey W. Lunsford, our Chief Financial Officer, Matthew Hale, and our Senior Vice President of Worldwide Sales, Marketing and Services, David M. Hatfield, have been hired since November 2006.

As a result, our senior management team has limited experience working together as a group. This lack of shared experience could harm our senior management team’s ability to quickly and efficiently respond to problems and effectively manage our business.

We have operations and personnel in Japan, the United Kingdom and Singapore, and we currently maintain network equipment in France, Germany, Hong Kong, Japan, the Netherlands and the United Kingdom. As part of our growth strategy, we intend to expand our sales and support organizations internationally, as well as to further expand our international network infrastructure. We have limited experience in providing our services internationally and such expansion could require us to make significant expenditures, including the hiring of local employees, in advance of generating any revenue. As a consequence, we may fail to achieve profitable operations that will compensate our investment in international locations. We are subject to a number of risks associated with international business activities that may increase our costs, lengthen our sales cycle and require significant management attention. These risks include:

Laws and regulations that apply to communications and commerce conducted over the Internet are becoming more prevalent, both in the United States and internationally, and may impose additional burdens on companies conducting business online or providing Internet-related services such as ours. Increased regulation could negatively affect our business directly, as well as the businesses of our customers, which could reduce their demand for our services. For example, tax authorities abroad may impose taxes on the Internet-related revenue we generate based on where our internationally deployed servers are located. In addition, domestic and international taxation laws are subject to change. Our services, or the businesses of our customers, may become subject to increased taxation, which could harm our financial results either directly or by forcing our customers to scale back their operations and use of our services in order to maintain their operations. In addition, the laws relating to the liability of private network operators for information carried on or disseminated through their networks are unsettled, both in the United States and abroad. Network operators have been sued in the past, sometimes successfully, based on the content of material disseminated through their networks. We may become subject to legal claims such as defamation, invasion of privacy and copyright infringement in connection with content stored on or distributed through our network. In addition, our reputation could suffer as a result of our perceived association with the type of content that some of our customers deliver. If we need to take costly measures to reduce our exposure to

these risks, or are required to defend ourselves against such claims, our financial results could be negatively affected.

We may need to obtain additional funding due to a number of factors beyond our control, including a shortfall in revenue, increased expenses, increase investment in capital equipment or the acquisition of significant businesses or technologies. We believe that our cash, plus cash from operations and the proceeds from this offering will be sufficient to fund our operations and proposed capital expenditures for at least the next 12 months. However, we may need funding before such time. If we do need to obtain funding, it may not be available on commercially reasonable terms or at all. If we are unable to obtain sufficient funding, our business would be harmed. Even if we were able to find outside funding sources, we might be required to issue securities in a transaction that could be highly dilutive to our investors or we may be required to issue securities with greater rights than the securities we have outstanding today. We might also be required to take other actions that could lessen the value of our common stock, including borrowing money on terms that are not favorable to us. If we are unable to generate or raise capital that is sufficient to fund our operations, we may be required to curtail operations, reduce our capabilities or cease operations in certain jurisdictions or completely.

The growth of our business depends on our ability to continue to develop effective business support systems. This is a complicated undertaking requiring significant resources and expertise. Business support systems are needed for:

Because our business plan provides for continued growth in the number of customers that we serve and services offered, there is a need to continue to develop our business support systems on a schedule sufficient to meet proposed service rollout dates. The failure to continue to develop effective business support systems could harm our ability to implement our business plans and meet our financial goals and objectives.

A change in accounting standards or practices can have a significant effect on our operating results and may affect our reporting of transactions completed before the change is effective. New accounting pronouncements and varying interpretations of existing accounting pronouncements have occurred and may occur in the future. Changes to existing rules or the questioning of current practices may adversely affect our reported financial results or the way we conduct our business. For example, our recent adoption of SFAS 123R in 2006 has increased the amount of stock-based compensation expense we record. This, in turn, has impacted our results of operations for the periods since this adoption and has made it more difficult to evaluate our recent financial results relative to prior periods.

As a public company, we will incur significant accounting and other expenses that we did not incur as a private company. These expenses include increased accounting, legal and other

professional fees, insurance premiums, investor relations costs, and costs associated with compensating our independent directors. In addition, the Sarbanes-Oxley Act of 2002, as well as rules subsequently implemented by the Securities and Exchange Commission and the Nasdaq Global Market, impose additional requirements on public companies, including requiring changes in corporate governance practices. For example, the listing requirements of the Nasdaq Global Market require that we satisfy certain corporate governance requirements relating to independent directors, audit committees, distribution of annual and interim reports, stockholder meetings, stockholder approvals, solicitation of proxies, conflicts of interest, stockholder voting rights and codes of conduct. Our management and other personnel will need to devote a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. For example, we expect these rules and regulations to make it more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur substantial additional costs to maintain the same or similar coverage. These rules and regulations could also make it more difficult for us to identify and retain qualified persons to serve on our board of directors, our board committees or as executive officers.

We must ensure that we have adequate internal financial and accounting controls and procedures in place so that we can produce accurate financial statements on a timely basis. We will be required to spend considerable effort on establishing and maintaining our internal controls, which will be costly and time-consuming and will need to be re-evaluated frequently. We have very limited experience in designing and testing our internal controls. We are in the process of documenting, reviewing and, if appropriate, improving our internal controls and procedures in anticipation of being a public company and eventually being subject to Section 404 of the Sarbanes-Oxley Act of 2002, which will require annual management assessments of the effectiveness of our internal control over financial reporting. In addition, we will be required to file a report by our independent registered public accounting firm addressing these assessments beginning with our Annual Report on Form 10-K for the year ended December 31, 2008. Both we and our independent auditors will be testing our internal controls in anticipation of being subject to Section 404 requirements and, as part of that documentation and testing, may identify areas for further attention and improvement. Implementing any appropriate changes to our internal controls may entail substantial costs to modify our existing financial and accounting systems, take a significant period of time to complete, and distract our officers, directors and employees from the operation of our business. These changes may not, however, be effective in maintaining the adequacy of our internal controls, and any failure to maintain that adequacy, or a consequent inability to produce accurate financial statements on a timely basis, could increase our operating costs and could materially impair our ability to operate our business. In addition, investors’ perceptions that our internal controls are inadequate or that we are unable to produce accurate financial statements may seriously affect our stock price.

Increasing our customer base and achieving broader market acceptance of our services will depend to a significant extent on our ability to expand our sales and marketing operations. Historically, we have concentrated our sales force at our headquarters in Tempe, Arizona. However, we have recently begun building a field sales force to augment our sales efforts and to bring our sales personnel closer to our current and potential customers. Developing such a field sales force will be expensive and we have limited knowledge in developing and operating a widely dispersed sales force. As a result, we may not be successful in developing an effective sales force, which could cause our results of operations to suffer.

We believe that there is significant competition for direct sales personnel with the sales skills and technical knowledge that we require. Our ability to achieve significant growth in revenue in the future will depend, in large part, on our success in recruiting, training and retaining sufficient numbers of direct sales personnel. We have expanded our sales and marketing personnel from a total of 13 at December 31, 2004 to 84 at April 30, 2007. New hires require significant training and, in most cases, take a significant period of time before they achieve full productivity. Our recent hires and planned hires may not become as productive as we would like, and we may be unable to hire or retain sufficient numbers of qualified individuals in the future in the markets where we do business. Our business will be seriously harmed if these expansion efforts do not generate a corresponding significant increase in revenue.

Our financial statements have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments about, among other things, taxes, revenue recognition, share-based compensation costs, contingent obligations and doubtful accounts. These estimates and judgments affect the reported amounts of our assets, liabilities, revenue and expenses, the amounts of charges accrued by us, and related disclosure of contingent assets and liabilities. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances and at the time they are made. If our estimates or the assumptions underlying them are not correct, we may need to accrue additional charges that could adversely affect our results of operations, investors may lose confidence in our ability to manage our business and our stock price could decline.

We may seek to acquire businesses or technologies that are complementary to our business. Acquisitions involve a number of risks to our business, including the difficulty of integrating the operations and personnel of the acquired companies, the potential disruption of our ongoing business, the potential distraction of management, expenses related to the acquisition and potential unknown liabilities associated with acquired businesses. Any inability to integrate operations or personnel in an efficient and timely manner could harm our results of operations. We do not have prior experience as a company in this complex process of acquiring and integrating businesses. If we are not successful in completing acquisitions that we may pursue in the future, we may be required to reevaluate our business strategy, and we may incur substantial expenses and devote significant management time and resources without a productive result. In addition, future acquisitions will require the use of our available cash or dilutive issuances of securities. Future acquisitions or attempted acquisitions could also harm our ability to achieve profitability. We may also experience significant turnover from the acquired operations or from our current operations as we integrate businesses.

The trading prices of the securities of technology companies have been highly volatile. Further, our common stock has no prior trading history. Factors affecting the trading price of our common stock will include:

In addition, if the market for technology stocks or the stock market in general experiences loss of investor confidence, the trading price of our common stock could decline for reasons unrelated to our business, operating results or financial condition. The trading price of our common stock might also decline in reaction to events that affect other companies in our industry even if these events do not directly affect us. Each of these factors, among others, could cause the value of your investment in our common stock to decline. Some companies that have had volatile market prices for their securities have had securities class actions filed against them. If a suit were filed against us, regardless of its merits or outcome, it could result in substantial costs and divert management’s attention and resources. This could harm our business and cause our operating results and financial condition to suffer.

Prior to this offering, there has been no public market for shares of our common stock. Although we have applied to have our common stock listed on the Nasdaq Global Market, an active public trading market for our common stock may not develop or, if it develops, may not be maintained after this offering. Our company, the representatives of the underwriters and our qualified independent underwriter will negotiate to determine the initial public offering price. The initial public offering price may be higher than the trading price of our common stock following this offering. As a result, you could lose all or part of your investment.

The price of our common stock could decline if there are substantial sales of our common stock in the public stock market after this offering. After this offering, we will have 78,333,587 outstanding

shares of common stock based on the number of shares outstanding as of March 31, 2007. This includes 14,400,000 shares being sold in this offering, all of which may be resold in the public market immediately following this offering. The remaining 63,933,587 shares, or approximately 82% of our outstanding shares after this offering, are currently restricted as a result of securities laws or lock-up agreements but will be able to be sold in the near future as set forth below:

After this offering and the expiration of the lock-up period, the holders of an aggregate of 44,138,255 shares of our common stock as of March 31, 2007, including entities affiliated with one of our lead underwriters for this offering, will have rights, subject to some conditions, to require us to file registration statements covering their shares or to include their shares in registration statements that we may file for ourselves or other stockholders. We also intend to register the issuance of all shares of common stock that we have issued and may issue under our option plans. Once we register the issuance of these shares, they can be freely sold in the public market upon issuance. Due to these factors, sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, or the perception in the market that the holders of a large number of shares intend to sell shares, could reduce the market price of our common stock.

The trading market for our common stock will depend in part on the research and reports that securities or industry analysts publish about us or our business. We do not currently have and may never obtain research coverage by securities and industry analysts. If no securities or industry analysts commence coverage of our company, the trading price for our stock may be negatively impacted. In the event we obtain securities or industry analyst coverage, if one or more of the analysts who covers us downgrades our stock or publishes unfavorable research about our business, our stock price would likely decline. If one or more of these analysts ceases coverage of our company or fails to publish reports on us regularly, demand for our stock could decrease, which could cause our stock price and trading volume to decline.

Upon completion of this offering, our directors and executive officers and their affiliates will beneficially own, in the aggregate, approximately 66% of our outstanding common stock, including approximately 39% beneficially owned by investment entities affiliated with Goldman, Sachs & Co., our co-lead underwriter in this offering, in each case assuming no exercise of the underwriters’ option to purchase additional shares from us. These amounts compare to approximately 18% of our outstanding

common stock represented by the shares sold in this offering, also assuming no exercise of the underwriters’ option to purchase additional shares from us. As a result, these stockholders will be able to exercise significant influence over all matters requiring stockholder approval, including the election of directors and approval of significant corporate transactions, such as a merger or other sale of our company or its assets. This concentration of ownership could limit your ability to influence corporate matters and may have the effect of delaying or preventing a third party from acquiring control over us.

In July 2006, we completed the sale of our Series B preferred stock to certain investors, after which sale certain entities affiliated with Goldman, Sachs & Co., the co-lead underwriter for this offering, held approximately 45% of the outstanding shares of our capital stock, and will hold approximately 39% after the completion of this offering. Because affiliates of Goldman, Sachs & Co. own more than 10% of our outstanding capital stock, Goldman, Sachs & Co. is deemed to be an affiliate of ours under Rule 2720(b)(1) of the NASD Conduct Rules and, therefore, the underwriters for this offering may also be deemed to have a conflict of interest under Rule 2720 of the NASD Conduct Rules. Accordingly, this offering will be made in compliance with the applicable NASD Conduct Rules, which require that the initial public offering price can be no higher than that recommended by a “qualified independent underwriter,” as defined by the NASD. Morgan Stanley & Co. Incorporated is serving in that capacity. We cannot assure you that the use of a qualified independent underwriter will be sufficient to eliminate any actual or potential conflicts of interest. For more information regarding the role of the qualified independent underwriter in this offering and other relationships we and our affiliates have with the underwriters, we refer you to the disclosure under the heading, “Underwriting.”

The initial public offering price per share is substantially higher than the pro forma net tangible book value per share of our common stock outstanding prior to this offering. As a result, investors purchasing common stock in this offering will experience immediate substantial dilution of $9.06 per share, based on an assumed initial public offering price of $11.00 per share, the mid-point of the range set forth on the cover page of this prospectus. In addition, we have issued options to acquire common stock at prices significantly below the initial public offering price. To the extent outstanding options are ultimately exercised, there will be further dilution to investors in this offering. This dilution is due in large part to the fact that our earlier investors paid substantially less than the initial public offering price when they purchased their shares of common stock. In addition, if the underwriters exercise their option to purchase additional shares from us or if we issue additional equity securities, you will experience additional dilution.

We are a Delaware corporation and the anti-takeover provisions of the Delaware General Corporation Law may discourage, delay or prevent a change in control by prohibiting us from engaging in a business combination with an interested stockholder for a period of three years after the person becomes an interested stockholder, even if a change in control would be beneficial to our existing stockholders. In addition, our restated certificate of incorporation and amended and restated bylaws may discourage, delay or prevent a change in our management or control over us that stockholders may consider favorable. Our restated certificate of incorporation and amended and restated bylaws, which will be in effect as of the closing of this offering:

For more information regarding these and other provisions, see the section titled “Description of Capital Stock — Anti-Takeover Effects of Delaware Law and our Certificate of Incorporation and Bylaws.”

Our management will have broad discretion to use the net proceeds from this offering, and you will be relying on the judgment of our management regarding the application of these proceeds. Our management might not apply the net proceeds of this offering in ways that increase the value of your investment. We expect to use the net proceeds from this offering for general corporate purposes, including working capital and capital expenditures, which may in the future include investments in, or acquisitions of, complementary businesses, services or technologies, or the repayment of all or a portion of our outstanding credit facility. We have not allocated these net proceeds for any specific purposes. Our management might not be able to yield a significant return, if any, on any investment of these net proceeds. You will not have the opportunity to influence our decisions on how to use the net proceeds from this offering.

We have never declared or paid any cash dividend on our common stock. We currently intend to retain any future earnings and do not expect to pay any dividends in the foreseeable future.

This prospectus contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts, included in this prospectus regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects and plans and objectives of management are forward-looking statements.

Forward-looking statements include, but are not limited to, statements about:

The words “anticipates,” “believes,” “estimates,” “expects,” “intends,” “may,” “plans,” “projects,” “will,” “would” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements that we make. We have included important factors in the cautionary statements included in this prospectus, particularly in the section entitled “Risk Factors,” that we believe could cause actual results or events to differ materially from the forward-looking statements that we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make. The forward-looking statements in this prospectus relate only to events as of the date on which the statements were made. We do not assume any obligation to update any forward-looking statements, except as required by law.

We estimate that we will receive net proceeds of approximately $114.2 million from the sale of the shares of common stock offered in this offering, based on an assumed initial public offering price of $11.00 per share, the mid-point of the range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and estimated offering expenses payable by us. Each $1.00 increase or decrease in the assumed initial public offering price of $11.00 per share would increase or decrease, as applicable, the net proceeds to us by approximately $10.6 million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting the estimated underwriting discounts and commissions payable by us. If the underwriters’ option to purchase additional shares is exercised in full, we estimate that our net proceeds will be approximately $136.3 million. We will not receive any proceeds from the sale of shares of common stock in this offering by the selling stockholders, although we will bear the costs, other than underwriting discounts and commissions, associated with the sale of these shares.

The principal purposes for this offering are to fund our capital expenditures for network and other equipment, to increase our working capital, to create a public market for our common stock, to increase our ability to access the capital markets in the future, to provide liquidity for our existing stockholders, to repay certain indebtedness and for general corporate purposes. We currently anticipate making aggregate capital expenditures of approximately $35.0 million to $45.0 million in each of 2007 and 2008, which will be funded by a combination of our cash and cash equivalents, expected cash flows from operations and the net proceeds of this offering. In addition, we intend to use a portion of the proceeds of this offering to repay the outstanding balance under our credit facility with Silicon Valley Bank, which we have historically used for working capital requirements. This credit facility carries a variable interest rate based on the prime or LIBOR rate ranging from 0% to 3.25% over the applicable rate and has maturation dates ranging from 2007 to 2011. At March 31, 2007, the outstanding balance under our credit facility with Silicon Valley Bank equalled approximately $23.8 million.

We may also use a portion of the net proceeds to acquire or invest in complementary businesses, products or services, or to obtain rights to such complementary technologies. We have no commitments with respect to any such acquisitions or investments. We may find it necessary or advisable to use the net proceeds for other purposes, and we will have broad discretion in the application of the net proceeds. Pending the uses described above, we intend to invest the net proceeds in short-term, interest-bearing, investment-grade securities.

We have never declared or paid any dividends on our capital stock. We currently expect to retain any future earnings for use in the operation and expansion of our business and do not anticipate paying any cash dividends. Any further determination to pay dividends on our common stock will be at the discretion of our board of directors and will depend on our financial condition, results of operations, capital requirements and other factors that our board of directors considers relevant.

The following table sets forth our unaudited cash, cash equivalents and capitalization as of March 31, 2007. Our cash, cash equivalents and capitalization is presented:

You should read this table together with the sections of this prospectus entitled “Selected Consolidated Financial Data” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and with our consolidated financial statements and related notes beginning on page F-1.

The number of pro forma as-adjusted shares of common stock shown as issued and outstanding is based on the number of shares of our common stock outstanding as of March 31, 2007 and excludes:

Our net tangible book value as of March 31, 2007 was $37.5 million, or $0.56 per share of pro forma common stock. Pro forma net tangible book value per share represents the amount of our total tangible assets reduced by the amount of our total liabilities and divided by the total number of shares of common stock outstanding including shares of common stock issued upon the conversion of all outstanding shares of our preferred stock. Dilution in pro forma as adjusted net tangible book value per share represents the difference between the amount per share paid by purchasers of shares of common stock in this offering and the pro forma as adjusted net tangible book value per share of common stock immediately after the completion of this offering. After giving effect to the sale of the shares of common stock offered by us at an assumed initial public offering price of $11.00 per share, the mid-point of the range set forth on the cover page of this prospectus, and after deducting the estimated underwriting discounts and estimated offering expenses payable by us, our pro forma as adjusted net tangible book value as of March 31, 2007 would have been $151.7 million, or $1.94 per share of common stock. This represents an immediate increase in pro forma net tangible book value of $1.38 per share to existing stockholders and an immediate dilution of $9.06 per share to new investors in our common stock. The following table illustrates this dilution on a per share basis:

A $1.00 increase or decrease in the assumed initial public offering price of $11.00 would increase or decrease, as applicable, our pro forma as adjusted net tangible book value per share after this offering by $0.14 per share and the dilution in pro forma as adjusted net tangible book value to new investors by $0.86 per share, assuming the number of shares offered by us, as set forth on the cover of this prospectus, remains the same and after deducting the estimated underwriting discounts and commissions and estimated offering expenses payable by us.

If the underwriters exercise their option to purchase additional shares of our common stock in full in this offering, the pro forma as adjusted net tangible book value per share after giving effect to this offering would be $2.16 per share, and the dilution in pro forma net tangible book value per share to investors in this offering would be $8.84 per share.

The following table summarizes, on a pro forma as adjusted basis as of March 31, 2007 and after giving effect to the offering, based on an assumed initial public offering price of $11.00 per share, the differences between existing stockholders and new investors with respect to the number of shares of common stock purchased from us, the total consideration paid to us and the average price per share paid.

A $1.00 increase or decrease in the assumed initial public offering price of $11.00 per share would increase or decrease, as applicable, total consideration paid by new investors and total

consideration paid by all stockholders by approximately $11.4 million, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same.

If the underwriters exercise their option to purchase additional shares in full, our existing stockholders would own 79.4% and our new investors would own 20.6% of the total number of shares of our common stock outstanding after this offering.

The above discussion and tables assume no exercise of 6,159,627 shares of common stock issuable upon the exercise of stock options outstanding as of March 31, 2007 with a weighted-average exercise price of approximately $2.94 per share. If all of these options were exercised, then:

The following tables provide our selected consolidated financial data. The selected consolidated statement of operations data for each of the three years in the period ended December 31, 2006, and the selected consolidated balance sheet data as of December 31, 2005 and 2006 have been derived from our audited consolidated financial statements included elsewhere in this prospectus. The selected consolidated balance sheet data as of December 31, 2004 was derived from our audited consolidated financial statements that are not included in this prospectus. The selected consolidated statement of operations data for the years ended December 31, 2002 and 2003 and the selected consolidated balance sheet data as of December 31, 2002 and 2003 have been derived from our unaudited consolidated financial statements that are not included in this prospectus. The selected consolidated statement of operations data for the three months ended March 31, 2006 and 2007, and the selected consolidated balance sheet data as of March 31, 2007, have been derived from our unaudited consolidated financial statements included elsewhere in this prospectus. Our unaudited selected consolidated financial data as of March 31, 2007 and for the three months ended March 31, 2006 and 2007 have been prepared on the same basis as the annual consolidated financial statements and include all adjustments, which include only normal recurring adjustments, necessary for the fair presentation of this data in all material respects. During the period from June 2001 through August 2003, we operated as a limited liability company. The share count and per share information for 2003 represents the end-of-year share count of the corporation. You should read this information together with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes included elsewhere in this prospectus. Our historical results are not necessarily indicative of the results to be expected in any future period.