Investor Inquiries Cindy Klimstra Vice President, Investor Relations 847.968.0268 cklimstra@cdw.com   CDW Corporation to Present at June Investor Conferences VERNON HILLS, Ill. - June 13, 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: Tuesday, June 20, 2006 NASDAQ 17th Investor Program Chancery Court Hotel, London, UK John A. Edwardson, Chairman & Chief Executive Officer Barbara A. Klein, Senior Vice President and Chief Financial Officer 11:15 a.m. ET (10:15 a.m. CT / 8:15 a.m. PT) Tuesday, June 27, 2006 William Blair 26th Annual Growth Stock Conference Four Seasons Hotel, Chicago, Illinois John A. Edwardson, Chairman & Chief Executive Officer 10:10 a.m. ET (9:10 a.m. CT / 7:10 a.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® ranked No. 343 on the FORTUNE 500, is a leading provider of technology solutions for business, government and education. CDW is a principal source of technology products and services including top name brands such as Adobe, Apple, Cisco, HP, IBM, Lenovo, Microsoft, Sony, Symantec, and Toshiba. CDW was founded in 1984 and employs approximately 4,350 coworkers. In 2005, the company generated sales of $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 approximately 120 factory-trained and A+ certified technicians on staff.