Exhibit 99.1

                            CERTIFICATION PURSUANT TO
                       18 U.S.C. SECTION 1350, AS ADOPTED
                             PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of Open Text Corporation (the
"Company") for the fiscal year ended June 30, 2002 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), I, P. Thomas Jenkins,
Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. (S) 1350,
as adopted pursuant to (S) 906 of the Sarbanes-Oxley Act of 2002, that:

(1)  The Report fully complies with the requirements of section 13(a) or 15(d)
     of the Securities Exchange Act of 1934, as amended; and

(2)  The information contained in the Report fairly presents, in all material
     respects, the financial condition and results of operations of the Company.



                                             /s/ P. Thomas Jenkins
                                             -----------------------------------
                                             P. Thomas Jenkins
                                             Chief Executive Officer

 Dated: September 25, 2002