Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Announces October Sales VERNON HILLS, Ill. - November 13, 2003 - CDW Corporation (Nasdaq: CDWC), a leading provider of technology products and services to business, government, and education, today announced sales for October 2003 of $490.4 million, an increase of 25.8 percent compared with sales of $389.7 million for October 2002. Both months had 23 billing days. Approximately 60 percent of the increase is attributed to sales made by former members of the Micro Warehouse sales force, who joined CDW in September in conjunction with the Micro Warehouse transactions. These sales are in line with the previously announced expectation that Micro Warehouse will contribute between $170 to $190 million to fourth quarter 2003 sales. Double-digit unit volume growth was achieved in a number of product categories. Most notably desktop, notebook, and server CPU unit volumes increased more than 30 percent for the month on a year-over-year basis. "We are very pleased with sales for the month of October, following our record sales in the third quarter," said John A. Edwardson, CDW's chairman and chief executive officer. "Both our corporate and public sectors experienced double-digit growth. While we are certainly encouraged by these growth trends, we remain cautiously optimistic about the future." The company plans to release November 2003 sales on Thursday, December 11. 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. In addition, there are a number of risks associated with our recent Micro Warehouse transaction. For example, there is no guarantee that the acquisition will have the benefits that we anticipate, that we will not encounter difficulty in the integration of the acquired assets and new personnel, that we will not be exposed to unanticipated liabilities arising from the acquisition or that the acquisition will not cause disruption to our existing business. About CDW CDW® (Nasdaq: CDWC), ranked No. 381 on the FORTUNE 500, is a leading provider of technology solutions 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 3,600 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, 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.