3Com to Announce Q1 Fiscal Year 2008 Results and Hold Conference Call on September 20, 2007

3Com Corporation (NASDAQ: COMS) will announce results for its first fiscal quarter ended August 31, 2007, on Thursday, September 20, 2007 after the stock market closes. Following the release, management will hold a conference call to discuss the Company’s financial results, quarterly highlights and business outlook. The conference call, which is available to the public, will begin at 5:00 p.m. EDT. To participate on the call, U.S. and international parties may dial (913) 981-5545. Alternatively, interested parties may listen to the live broadcast of the call over the Internet at 3Com’s Investor Relations Web site (www.3com.com/investor) in the Earnings Webcast section. For those unable to participate on the live call, a 24-hour replay will be available starting at 8:00 p.m. EDT on September 20 by dialing (719) 457-0820, or (888) 203-1112, Confirmation Code: 8436622. A replay also will be available over the Internet at 3Com’s Investor Relations Web site (www.3com.com/investor) in the Earnings Webcast section. The replay will be available for approximately three weeks after posting. A copy of the news release announcing the results as well as related financial and business information will be available on 3Com Corporation’s Web site, www.3Com.com, after close of the market on September 20. About 3Com Corporation 3Com Corporation (NASDAQ: COMS) is a leading provider of secure, converged voice and data networking solutions for enterprises of all sizes. 3Com offers a broad line of innovative products backed by world-class sales, service and support, which excel at delivering business value for its customers. Through its TippingPoint division, 3Com is a leading provider of network-based intrusion prevention systems that deliver in-depth application protection, infrastructure protection, and performance protection. 3Com also owns H3C Technologies Co., Limited (H3C), a China-based provider of network infrastructure products. H3C brings innovative and cost-effective product development and manufacturing and a strong footprint in one of the world’s most dynamic markets. For further information, please visit www.3com.com, or the press site www.3com.com/pressbox. Copyright © 2007 3Com Corporation. 3Com, the 3Com logo and TippingPoint are registered trademarks of 3Com Corporation. All other company and product names may be trademarks of their respective holders