Investor Inquiries Cindy Klimstra Vice President, Investor Relations 847-968-0268   CDW to Host 2006 Analyst Day VERNON HILLS, Ill. - November 1, 2006 - CDW Corporation (NASDAQ: CDWC) today announced that members of its senior management will present at the Company's 2006 Analyst Day event at its North Las Vegas, Nevada distribution center on Wednesday, November 8, 2006. The event will be webcast live at www.cdw.com/investor. The event will begin at 12:00 Noon ET / 9:00 a.m. PT and conclude at approximately 3:30 p.m. ET / 12:30 p.m. PT. The webcast will be available for replay for approximately three weeks. Factors affecting CDW’s business and prospects are discussed in the Company's most recent press releases and filings with the Securities and Exchange Commission. Individuals who listen to the webcast will be presumed to have read these documents. Event date and time are subject to change and are based upon current expectations. 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 Acer, Adobe, Apple, Cisco, HP, IBM, Lenovo, Microsoft, Panasonic, Samsung, Sony, Symantec, Toshiba and ViewSonic. CDW's direct model offers customers one-on-one relationships with knowledgeable account managers and access to more than 600 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 5,250 coworkers. In 2005, the company generated sales of $6.3 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.