EXHIBIT 32.1 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 Quarterly Report on Form 10-Q/A of MRO Software, Inc., (the "Company") for the quarter ended December 31, 2004, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), each of the undersigned President & Chief Executive Officer, and Executive Vice President of Finance & Administration, CFO & Treasurer of the Company, certifies, to the best knowledge and belief of the signatory, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that: The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company. /s/ Norman E. Drapeau, Jr. /s/ Peter J. Rice - ------------------------------------- ---------------------------------------- Norman E. Drapeau, Jr. Peter J. Rice President & Chief Executive Officer Executive Vice President, Finance & Date: February 11, 2005 Administration, CFO & Treasurer Date: February 11, 2005