Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Announces July Sales VERNON HILLS, Ill. - August 12, 2003 - CDW Corporation, (Nasdaq: CDWC), a leading provider of technology products and services to business, government and education, today announced sales for July 2003 of $377.9 million, compared with sales of $386.1 million for July 2002. Both months had 22 billing days. "We're pleased with our results for the month in light of the tough comparison we had versus July 2002," said John A. Edwardson, CDW's chairman and chief executive officer. "Our sales in July of last year were unusually high due to the exceptional level of Microsoft software we sold in conjunction with the Microsoft Upgrade Advantage program, which concluded in early August 2002. Total sales of Microsoft software and Upgrade Advantage were approximately 14% of our revenue in July 2002, compared with approximately 7% in July 2003. Overall, software continues to be our largest product category due to strength in security, anti-virus, and backup software. In addition, we saw an uptick in non-software sales in July compared with a year ago." The company plans to release August 2003 sales on Wednesday, September 10. About CDW CDW® (Nasdaq: CDWC), ranked No. 381 on the FORTUNE 500, is a leading provider of technology products and services for businesses, government agencies and educational institutions nationwide. CDW is a principal source of technology including 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 over 3,000 coworkers whose efforts generated net sales of more than $4.2 billion in 2002. 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 or customized CDW@work™ extranets; 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.