**EXHIBIT 32.1****CERTIFICATIONOF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002**The undersigned, David Mitchell, President and Chief Executive Officer of webMethods, Inc. (the“Company”), has executed this certification in connection with the filing with the Securities andExchange Commission of the Company’s quarterly report on Form 10-Q for the three months endedSeptember 30, 2006 (the “Report”). The undersigned hereby certifies that: (1) the Report fullycomplies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934;and (2) the information contained in the Report fairly presents, in all material respects, thefinancial condition and results of operations of the Company.       Date: November 13, 2006 /s/ David Mitchell         Name: David Mitchell    Title: President and Chief Executive Officer  
 

 
**CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002The undersigned, Mark L. Wabschall, Executive Vice President and Chief Financial Officer ofwebMethods, Inc. (the “Company”), has executed this certification in connection with the filingwith the Securities and Exchange Commission of the Company’s quarterly report on Form 10-Q for thethree months ended September 30, 2006 (the “Report”). The undersigned hereby certifies that: (1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the SecuritiesExchange Act of 1934; and (2) the information contained in the Report fairly presents, in allmaterial respects, the financial condition and results of operations of the Company.       Date: November 13, 2006 /s/ Mark L. Wabschall         Name: Mark L. Wabschall    Title: Executive Vice President and ChiefFinancial Officer  
 

 
**CERTIFICATIONOF PRINCIPAL FINANCIAL OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002**The undersigned, John Andary, Executive Vice President ofwebMethods, Inc. (the “Company”), has executed this certification in connection with the filingwith the Securities and Exchange Commission of the Company’s quarterly report on Form 10-Q for thethree months ended September 30, 2006 (the “Report”). The undersigned hereby certifies that: (1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the SecuritiesExchange Act of 1934; and (2) the information contained in the Report fairly presents, in allmaterial respects, the financial condition and results of operations of the Company.       Date: November 13, 2006 /s/ John Andary         Name: John Andary    Title: Executive Vice President  
 

 
**CERTIFICATION OF CHIEF ACCOUNTING OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TOSECTION 906 OF THE SARBANES-OXLEY ACT OF 2002**The undersigned, Michael Krone, Vice President and Chief Accounting Officer of webMethods, Inc.(the “Company”), has executed this certification in connection with the filing with the Securitiesand Exchange Commission of the Company’s quarterly report on Form 10-Q for the three months endedSeptember 30, 2006 (the “Report”). The undersigned hereby certifies that: (1) the Report fullycomplies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934;and (2) the information contained in the Report fairly presents, in all material respects, thefinancial condition and results of operations of the Company.       Date: November 13, 2006 /s/ Michael Krone         Name: Michael Krone    Title: Vice President and Chief Accounting Officer  
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