Investor Inquiries Cindy Klimstra Vice President, Investor Relations 847-968-0268 cklimstra@cdw.com   CDW Corporation to Present at May Investor Conferences VERNON HILLS, Ill. - May 3, 2006 - CDW Corporation (NASDAQ: CDWC), a leading provider of technology products and services to business, government and education, today announced that the company is scheduled to present at the following conferences: Wednesday, May 10, 2006 Baird 2006 Growth Stock Conference Four Seasons Hotel, Chicago, Illinois James R. Shanks, executive vice president 2:55 p.m. ET (1:55 p.m. CT / 11:55 a.m. PT) Tuesday, May 23, 2006 UBS Enterprise Technology and Services Conference The Westin Times Square, New York, New York Harry J. Harczak, executive vice president 3:30 p.m. ET (2:30 p.m. CT / 12:30 p.m. PT) The presentations can be accessed via live audio webcast at www.cdw.com/investor and replays will be available shortly thereafter for approximately two weeks. About CDW CDW® (NASDAQ: CDWC), ranked No. 343 on the FORTUNE 500, is a leading provider of technology products and services for business, government and education. CDW is a principal source of technology from top name brands such as Adobe, APC, Apple, Cisco, HP, IBM, Lenovo, Microsoft, Sony, Symantec, Toshiba and ViewSonic. CDW was founded in 1984 and today employs approximately 4,300 coworkers. In 2005, the company generated sales of approximately $6.3 billion. CDW's direct model offers one-on-one relationships with knowledgeable account managers; purchasing by telephone, fax, the company's award-winning CDW.com web site, customized CDW@work™ extranets, CDWG.com web site and macwarehouse.com web site; custom configured solutions and same day shipping; and pre- and post-sales technical support, with more than 120 factory-trained and A+ certified technicians on staff. For more information about CDW: Visit CDW on the Internet at http://www.cdw.com. Contact CDW Investor Relations via the Internet at investorrelations@cdw.com or by telephone at 847-419-6328.