Exhibit 32.1

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

I, Robert Y. L. Mao, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of 3Com Corporation on Form 10-K for the fiscal year ended May 29, 2009 fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Annual Report on Form 10-K fairly presents, in all material respects, the financial condition and results of operations of 3Com Corporation.

By:  /s/  ROBERT Y. L. MAO

Name: Robert Y. L. Mao

Title: Chief Executive Officer

Date: July 24, 2009

I, Jay Zager, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual Report of 3Com Corporation on Form 10-K for the fiscal year ended May 29, 2009 fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Annual Report on Form 10-K fairly presents, in all material respects, the financial condition and results of operations of 3Com Corporation.

By:  /s/   JAY ZAGER

Name: Jay Zager

Title: Executive Vice President, Chief Financial Officer

Date: July 24, 2009

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