Investor Inquiries Cindy Klimstra Vice President, Investor Relations (847) 968-0268 Media Inquiries Gary Ross Sr. Manager, Corporate Communications (847) 371-5048 CDW's Average Daily Sales Increase 22.8 Percent in April 2007 VERNON HILLS, Ill. - May 9, 2007 - CDW Corporation (NASDAQ: CDWC), a leading provider of technology products and services to business, government and education, today announced average daily sales for April 2007 were $29.571 million, an increase of 22.8 percent compared to average daily sales of $24.088 million for April 2006. Total sales for April 2007 were $621.0 million, an increase of 28.9 percent compared to total sales of $481.8 million for April 2006. There were 21 billing days in April 2007 and 20 billing days in April 2006. As previously announced, CDW completed the acquisition of Berbee Information Networks Corporation on October 11, 2006. April 2006 sales do not include Berbee sales, while April 2007 sales include Berbee sales. Excluding Berbee sales in April 2007, and therefore on a non-GAAP basis, CDW's average daily sales for April 2007 were $27.519 million, an increase of 14.2 percent compared to average daily sales for April 2006 of $24.088 million and total sales for April 2007 were $577.9 million, an increase of 20.0 percent compared to total sales of $481.8 million for April 2006. There were 21 billing days in April 2007 and 20 billing days in April 2006. In April 2007, average daily sales for the corporate sector segment increased 12.3 percent and average daily sales for the public sector segment increased 19.0 percent compared to the prior year period. While CDW did not own Berbee prior to October 11, 2006, the Company is providing comparative information for Berbee. Compared to the prior year period, average daily sales for Berbee increased 28.3 percent in April 2007. Compared to the public sector and corporate sector segments, Berbee's business model is more project oriented, which can result in a greater degree of variability in sales on a monthly basis. Product categories that achieved the strongest year-over-year unit volume growth for the month on an average daily basis included notebook computers, desktop computers, data storage, software, video and input devices. Product categories exclude Berbee sales. "Our recent sales results demonstrate that we have strengthened our market position following our efforts last year to more strategically align our sales force, further segment our customer base, and increase our focus on services and advanced technology solutions. We will continue to emphasize profitable growth," said John A. Edwardson, chairman and chief executive officer. The Company plans to announce May 2007 sales on Monday, June 11, 2007. May 2006 had 22 billing days and May 2007 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. 342 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 Acer, Adobe, APC, Apple, Cisco, Fujitsu, HP, IBM, Lenovo, Microsoft, Panasonic, Quantum, Samsung, Sony, Symantec and ViewSonic. CDW's direct model offers customers one-on-one relationships with knowledgeable account managers and access to approximately 820 on-staff engineers and advanced technology specialists who customize solutions for customers' complex technology needs. CDW also provides same-day product shipping and post-sales technical support. CDW was founded in 1984 and as of March 31, 2007, employed approximately 5,640 coworkers. In 2006, the company generated sales of $6.8 billion. For more information, visit CDW.com. For more information about CDW: Visit CDW on the Internet at http://www.cdw.com. Contact CDW Investor Relations via the Internet at investorrelations@cdw.com or by telephone at 847-419-6328. CDW is a registered trademark and CDW@work is a trademark of CDW Corporation. Other company and product names may be trademarks of their respective owners.