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, Bruce L. Claflin, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of 3Com Corporation on Form 10-Q for the fiscal quarter ended February 27, 2004 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 Quarterly Report on Form 10-Q fairly presents in all material respects the financial condition and results of operations of 3Com Corporation.

Date:	April 7, 2004	By:	/s/     BRUCE L. CLAFLIN
		Name:  Bruce L. Claflin
		Title:  President and Chief Executive Officer

I, Mark Slaven, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of 3Com Corporation on Form 10-Q for the fiscal  quarter ended February 27, 2004 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 Quarterly Report on Form 10-Q fairly presents in all material respects the financial condition and results of operations of 3Com Corporation.

Date:	April 7, 2004	By:	/s/     MARK SLAVEN
		Name:		Mark Slaven
		Title:		Executive Vice President, Finance
		and Chief Financial Officer