Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Climbs FORTUNE 500 List, Ranks In Top Ten Percent In Key Categories VERNON HILLS, Ill. - March 31, 2004 - For the fourth consecutive year, CDW Corporation (Nasdaq: CDWC) improved its position on FORTUNE magazine's "FORTUNE 500" list. In addition to its No. 376 ranking on this year's list, the company scored within the top ten percent of all FORTUNE 500 companies in several categories measuring profitability and performance. CDW, a leading provider of technology products and services to business, government and education, ranked: No. 5 in total return to shareholders over the past ten years No. 21 in most revenues per dollar of assets in 2003 No. 49 in most revenues per employee in 2003 "CDW's performance in this year's FORTUNE 500 shows how our success has paid off for customers, shareholders, and our coworkers" said John A. Edwardson, chairman and chief executive officer of CDW. "In 2004, our mission is to build on our company's success by getting our customers the technology they need when they need it and continuing to do that better than anyone else." The 2004 FORTUNE 500 list appears in the April 5, 2004 issue of FORTUNE magazine. About CDW CDW® (Nasdaq: CDWC), ranked No. 376 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 APC, Apple, Cisco, HP, IBM, Microsoft, Sony, Symantec, Toshiba and ViewSonic. CDW distributes contracts to end users for customized and standardized on-site services supplied directly by providers such as HP Services and Unisys and for training programs provided by firms such as KnowledgeNet and Productivity Point International. CDW was founded in 1984 as a home-based business and today employs approximately 3,700 coworkers. In 2003, the company generated net sales of approximately $4.7 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 100 factory-trained and A+ certified technicians on staff. Additional information can be found by visiting CDW.com.