Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Promotes Welyki To Vice President VERNON HILLS, Ill. - August 20, 2003 - CDW Corporation, (Nasdaq: CDWC), a leading provider of technology products and services to business, government and education, today announced Robert Welyki, 39, has been promoted to vice president - treasurer. Welyki is responsible for all tax, treasury and risk management activities. He joined CDW in November 2000 as director of tax and treasury and was promoted to his most recent position, treasurer, in 2002. Prior to CDW, Welyki was vice president and treasurer of CCC Information Services. He earned a bachelor's degree in accounting from University of Illinois and is a certified public accountant. Welyki reports to Barbara Klein, senior vice president and chief financial officer. 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.