CDW's Average Daily Sales Increase 11.9 Percent in January 2007.

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 January 2007 were $27.393 million, an increase of 11.9 percent compared to average daily sales of $24.474 million for January 2006. Total sales for January 2007 were $602.6 million, an increase of 17.3 percent compared to total sales of $513.9 million for January 2006. There were 22 billing days in January 2007 and 21 billing days in January 2006.

As previously announced, CDW completed the acquisition of Berbee Information Networks Corporation on October 11, 2006. January 2006 sales do not include Berbee sales, while January 2007 sales include Berbee sales. Excluding Berbee sales in January 2007, and therefore on a non-GAAP basis, CDW's average daily sales for January 2007 were $25.880 million, an increase of 5.7 percent compared to average daily sales for January 2006 of $24.474 million. Excluding Berbee sales in January 2007, and therefore on a non-GAAP basis, total sales for January 2007 were $569.4 million, an increase of 10.8 percent compared to total sales of $513.9 million for January 2006.

Average daily sales for the public sector segment increased 10.8 percent and average daily sales for the corporate sector segment increased 3.9 percent compared to the prior year period. Public sector and corporate sector sales exclude Berbee sales.

Product categories that achieved the strongest year-over-year unit volume growth for the month on an average daily basis included: notebook computers, server CPUs, data storage, netcomm products, video and input devices. Product categories exclude Berbee sales.

The Company plans to announce February 2007 sales on Friday, March 9, 2007. February 2006 had 20 billing days and February 2007 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, 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 more than 760 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 employs approximately 5,480 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 [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.