Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW'S Average Daily Sales Increase 9.6 Percent in November 2004 VERNON HILLS, Ill. - December 8, 2004 - CDW Corporation (NASDAQ: CDWC), a leading provider of technology products and services to business, government and education, today announced average daily sales for November 2004 were $22.033 million, an increase of 9.6 percent compared to average daily sales of $20.109 million for November 2003. Total sales for November 2004 were $462.7 million based on 21 billing days. Total sales for November 2003 were $382.1 million based on 19 billing days. Both the corporate and public sector segments grew in November 2004. Product categories that achieved year-over-year double digit unit volume growth for the month included notebook CPUs, desktop CPUs, server CPUs, software, data storage, and video. "During the month of November 2004, we achieved a new year-to-date milestone by surpassing the $5 billion mark in sales for the year," said John A. Edwardson, chairman and chief executive officer. "To reach our goals of gaining market share and growing profitably, we have continued to build upon our core competencies, develop new initiatives, and increase productivity." The Company plans to announce December 2004 sales and fourth quarter earnings on Tuesday, January 25, 2005. December 2003 had 21 billing days and December 2004 will have 22 billing days. Forward Looking Statement Any forward-looking statements contained in this release are based on the Company's beliefs and expectations as of the date of this release and are subject to certain risks and uncertainties which may have a significant impact on the Company's business, operating results or financial condition. Should any risk or uncertainty materialize, or should underlying assumptions prove incorrect, actual results or outcomes may vary materially from those described in forward-looking statements. Factors affecting the Company's business and prospects are discussed in the Company's filings with the Securities and Exchange Commission. About CDW CDW® (Nasdaq: CDWC), ranked No. 376 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.