Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Corporation Prices Secondary Offering VERNON HILLS, Ill. - March 25, 2004 - CDW Corporation (Nasdaq: CDWC), today announced that it has commenced its secondary offering at a price of $65.05 per share. The total number of shares to be sold in this offering is 4,120,000. The shares will be sold by the following shareholders: 3,007,000 shares by Michael P. Krasny, the Company's founder and former chief executive officer and current director and chairman emeritus; 742,000 shares by Circle of Service Foundation; and 371,000 shares by Circle of Service Supporting Foundation. Mr. Krasny has also granted the underwriters a 30-day over-allotment option to purchase from him an additional total of up to 618,000 shares of common stock. All shares in the offering are being sold by the selling shareholders and the total number of shares outstanding will not change as a result of the offering. CDW is not selling any shares and will not receive any of the proceeds from, nor incur any material expenses in connection with, the sales by the selling shareholders. After the offering, assuming the over-allotment option is not exercised, Mr. Krasny will beneficially own a total of 18,321,901 shares of the Company's common stock, or 21.8% of the total current outstanding common shares. At this level of ownership, Mr. Krasny will continue to be the Company's largest shareholder. The offering is being lead-managed by Morgan Stanley & Co. Incorporated. Additional underwriters include Goldman, Sachs & Co., William Blair & Company, L.L.C., Raymond James & Associates, Inc. and Robert W. Baird & Co. Incorporated. Copies of the prospectus may be obtained from Morgan Stanley & Co. Incorporated, 1585 Broadway, New York, NY 10036. 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.