CDW's Average Daily Sales Increase 7.5 Percent in August 2006.

VERNON HILLS, Ill. -- CDW Corporation (NASDAQ:CDWC), a leading provider of technology products and services to business, government and education, today announced average daily sales for August 2006 were $26.964 million, an increase of 7.5 percent compared to average daily sales of $25.076 million for August 2005. Total sales for August 2006 were $620.2 million, an increase of 7.5 percent compared to total sales of $576.8 million for August 2005. There were 23 billing days in August 2006 and 23 billing days in August 2005.

Average daily sales for the public sector segment increased 23.9 percent and average daily sales for the corporate sector segment decreased 0.2 percent compared to the prior year period.

As previously announced, in the first half of 2006, the Company realigned its corporate sector account managers serving medium and large customer accounts into five geographic regions. A significant number of customer accounts were transferred among corporate account managers due to the geographic realignment. The investment of account managers' time to further develop these customer relationships affected corporate sector sales growth in August 2006. The Company firmly believes that the geographic realignment of the corporate sector will provide long-term benefits including 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 the Company's 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, printers, video, memory and input devices.

The Company plans to announce September 2006 sales and third quarter earnings on Wednesday, October 18, 2006. September 2005 had 21 billing days and September 2006 will have 20 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(R), 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 Acer, Adobe, Apple, Cisco, HP, IBM, Lenovo, Microsoft, Panasonic, Samsung, Sony, Symantec, Toshiba and ViewSonic.

CDW was founded in 1984 and employs approximately 4,450 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(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.

For more information about CDW:

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.

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.