Investor Inquiries Cindy Klimstra Vice President, Investor Relations 847.968.0268 cklimstra@cdw.com Media Inquiries Gary Ross Sr. Manager, Corporate Communications 847.371.5048 garyross@cdw.com CDW Corporation Announces 21 Percent Increase in Annual Dividend VERNON HILLS, Ill. - May 17, 2006 - CDW Corporation (NASDAQ: CDWC), a leading provider of technology products and services to business, government and education, today announced that its Board of Directors declared an annual cash dividend of $0.52 per share, payable to common stock shareholders of record on June 16, 2006, with payment on June 30, 2006. The dividend amount represents an increase of 21 percent over the previous annual dividend of $0.43 per share, and is the company’s fourth dividend payment since initiating a dividend in 2003. The company plans to announce any future dividend payments following the company’s annual shareholders meeting, typically held in May. "We are pleased that our Board has increased our cash dividend for the third consecutive year. CDW’s financial performance has continued to generate strong cash flows, and we remain confident in our long-term ability to increase shareholder value by serving our customers and investing in our future growth," said John A. Edwardson, chairman and chief executive officer. "In addition to the dividend, which will return approximately $41 million to shareholders, we repurchased approximately $128 million of CDW stock during the first quarter of 2006. From 2001 through the first quarter of 2006, CDW has returned approximately $865 million to shareholders through share repurchases and dividends," said Edwardson. "As previously announced, our Board authorized a new share repurchase program of up to 5 million shares of Company stock, which is expected to remain effective through April 30, 2008, unless earlier terminated by the Board or completed." 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® ranked No. 343 on the FORTUNE 500, is a leading provider of technology solutions for business, government and education. CDW is a principal source of technology products and services including top name brands such as Adobe, Apple, Cisco, HP, IBM, Lenovo, Microsoft, Sony, Symantec, and Toshiba. CDW was founded in 1984 and employs approximately 4,350 coworkers. In 2005, the company generated sales of $6.3 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 approximately 120 factory-trained and A+ certified technicians on staff.