Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW and CDW-G Achieve ISO Registration VERNON HILLS, Ill. January 8, 2001 - CDW Computer Centers, Inc. (Nasdaq: CDWC), the nation's direct solutions provider of brand name computing products, announced today that it has earned registration to the prestigious ISO Quality Management Standard ISO 9002:1994. CDW's ISO registration indicates the company's compliance with world-class quality principles published by the International Organization for Standardization, a network of the national standards institutes of 130 countries, headquartered in Geneva, Switzerland. The registration extends to CDW-Government, Inc., a wholly-owned subsidiary of CDW that provides computing solutions to government agencies and educational institutions. "This achievement stems from our dedication to our core Circle of Service philosophy, which is designed to put the customer at the center of everything we do," said Michael Krasny, CDW Chairman and CEO. "ISO registration reflects our daily efforts to uphold our quality statement: 'Together we strive for perfection.' Coworkers throughout the organization surround our customers with consistent, high-quality customer experiences." CDW's ISO registration is the result of a comprehensive audit by The Registrar Company, Inc., an independent firm authorized to evaluate compliance with ISO standards. The Registrar Company also evaluated CDW for compliance with ISO9001:2000 FDIS, a new quality standard still being finalized by the ISO. 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.