Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Ranks Among the Hottest Companies on the Internet VERNON HILLS, Ill. - May 4, 1999 - CDW Computer Centers, Inc. (NASDAQ: CDWC) ranked among the leading high-tech companies on Business 2.0's list of the Top 100 Hottest Companies on the Net, a ranking that highlights the key drivers in the explosive E-commerce movement. "We are pleased to see CDW recognized as an E-commerce pioneer and a major player," said Greg Zeman, CDW president. "With cdw.com, we have built an easy-to-use, powerful tool to harness the power of the Internet. CDW's strong position in this ranking confirms that our model gives customers the best of both worlds: the ultimate online shopping experience backed by outstanding service and support." CDW was recognized as No. 43 on the list which is published in the magazine's May issue. After researching more than 600 candidates, Business 2.0 rated 100 companies on annual web revenue, purity of web business and growth momentum. In terms of Web growth momentum, CDW posted a 181 percent increase of unassisted Web sales for the first quarter of 1999 over the same period in 1998. The site currently hosts more than 66,000 unique users each day. As one of the early trailblazers on the E-commerce scene, www.cdw.com launched in April 1995, with online ordering introduced a year later. Throughout the site's evolution, www.cdw.com has introduced pioneering advancements including compare features, CDW Compare™ and CDW Smart Search™, along with a sophisticated extranet program, CDW@work™. This ranking solidifies www.cdw.com's position as one of the premier computer industry sites. Other recent CDW Web honors include Computer Shopper's Best Vendor Web site, Catalog Age's Top 10 E-commerce sites, and Computer Retail Week's Most Efficient Operations for an Internet Retailer. About CDW CDW® (Nasdaq: CDWC), ranked No. 3 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.