CDW's Sales Increase 13.8 Percent in August 2005; Average Daily Sales Increase 8.9 Percent in August 2005.

VERNON HILLS, Ill. -- CDW Corporation (NASDAQ:CDWC), a leading provider of technology products and services to business, government and education, today announced August 2005 sales were $576.8 million, an increase of 13.8 percent compared to August 2004 sales of $506.7 million. Average daily sales for August 2005 were $25.076 million, an increase of 8.9 percent compared to average daily sales of $23.030 million for August 2004. There were 23 billing days in August 2005 and 22 billing days in August 2004. E[acute accent]The corporate and public sector segments both grew in August 2005. Within the public sector segment, average daily sales grew in the state and local government, education, and healthcare channels, while average daily sales in the federal government channel were flat compared to the prior year. The federal government's fiscal year ends in September. E[acute accent]Product categories that achieved year-over-year double-digit unit volume growth for the month on an average daily basis included desktop CPUs, data storage, software, printers, and video. E[acute accent]The Company plans to announce September 2005 sales and third quarter earnings on Tuesday, October 18, 2005. September 2004 had 21 billing days and September 2005 will have 21 billing days.

E[acute accent]Forward Looking Statement

E[acute accent]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.

E[acute accent]About CDW

E[acute accent]CDW(R) (NASDAQ:CDWC), ranked No. 347 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 Adobe, APC, Apple, Cisco, HP, IBM, Microsoft, Sony, Symantec, Toshiba and ViewSonic. E[acute accent]CDW was founded in 1984 and today employs approximately 4,000 coworkers. In 2004, the company generated sales of $5.7 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(TM) 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.

E[acute accent]For more information about CDW:

E[acute accent]Visit CDW on the Internet at http://www.cdw.com. Contact CDW Investor Relations via the Internet at [e-mail] or by telephone at 847-419-6328.