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'S Average Daily Sales Increase 5.5 Percent in April 2006 VERNON HILLS, Ill. - May 9, 2006 - CDW Corporation (NASDAQ: CDWC), a leading provider of technology products and services to business, government and education, today announced average daily sales for April 2006 were $24.088 million, an increase of 5.5 percent compared to average daily sales of $22.834 million for April 2005. Total sales for April 2006 were $481.8 million based on 20 billing days compared to total sales of $479.5 million based on 21 billing days. Both the corporate and public sector segments grew average daily sales in April 2006. The public sector segment achieved 13.4 percent growth on an average daily basis and the corporate sector segment achieved 2.5 percent growth on an average daily basis. As previously announced, the Company completed the geographic realignment of its corporate sector segment in March 2006. Accounts affected were predominantly medium and large business customers with 100 or more employees. Account managers impacted by the geographic realignment have retained their top accounts, while remaining customer accounts have been redistributed throughout the corporate sales organization based on five geographic regions. The comprehensive transition process, which occurred during March and April, included the introduction of approximately 53,000 customer accounts to their re-assigned dedicated account managers and product specialist teams. The Company believes the transition affected sales growth in the medium and large business channel in April 2006. The corporate sector sales team that predominantly serves small business customers with fewer than 100 employees was not affected by the transition. The public sector sales team was also not affected, since state and local government, education, and healthcare customers within the public sector are already segmented by geographic region. Expected advantages from the geographic realignment include the enhanced ability to serve customers, drive new business, maximize account coverage, create additional ownership and accountability for the medium and large business sales teams, and align geographically with our vendor and service partners. Product categories that achieved the strongest year-over-year unit volume growth for the month on an average daily basis included notebook CPUs, software, video, and memory. The Company plans to announce May 2006 sales on Friday, June 9, 2006. May 2005 had 21 billing days and May 2006 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® 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.