Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW To Release Third Quarter Results On October 22, 2003 VERNON HILLS, Ill. - October 7, 2003 - CDW Corporation (Nasdaq: CDWC) will release its third quarter 2003 results and September sales on Wednesday, October 22, 2003 at 7:30 a.m. Eastern Daylight Time (EDT). On October 22, 2003 at 8:30 a.m. EDT, management will review these results during a conference call. This conference call will be available via live Webcast – in listen-mode only – on the Company's Web site at CDW.com and through streetevents.com. An audio replay of the call will be available approximately two hours after the event on streetevents.com until November 7, 2003. About CDW CDW® (Nasdaq: CDWC), ranked No. 381 on the FORTUNE 500, is a leading provider of technology products and services for businesses, government and education. 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. Additional information can be found by visiting CDW.com.