Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, each of the undersigned officers of Parametric Technology Corporation (the
“Company”)
certifies that, to his knowledge, the Amendment No. 1 to Quarterly Report on Form 10-Q of the
Company for the quarter ended
June 30, 2007 fully complies with the requirements of Section 13(a)
or 15(d) of the Securities Exchange Act of 1934 and information contained in that Form 10-Q fairly
presents, in all material respects, the financial condition and results of operations of the
Company.