EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our reports dated July 25, 2008, relating to the financial statements and financial statement schedule of 3Com Corporation (which report expresses an unqualified opinion and includes an explanatory paragraph relating to the adoption of Statement of Financial Accounting Standards No. 123(Revised), Share-Based Payment), and the effectiveness of 3Com Corporation’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of 3Com Corporation for the year ended May 30, 2008.

/S/ DELOITTE & TOUCHE LLP  

Boston, Massachusetts 

July 25, 2008