Please direct your media and public relations inquiries to: mediarelations@cdw.com 800-800-4CDW CDW Earns Cisco Premier Certification. Customers Benefit from Expanded Access to Expertise and Resources VERNON HILLS, Ill. - April 6, 2004 - CDW Corporation (Nasdaq: CDWC),a FORTUNE 500 provider of technology products and services today announced the company has achieved Cisco Systems, Inc. Premier Certification. This designation means CDW has met Cisco's strict criteria for technical expertise, customer satisfaction and other metrics that enable CDW to provide customers with the right technologies for their specific needs. CDW will now have expanded access to Cisco customer satisfaction tools and technical resources. As part of the certification, CDW has also achieved a wireless local area network (WLAN) specialization. This specialization recognizes CDW's ability to plan, design, implement and operate Cisco WLAN solutions. Achieving this certification is part of CDW's ongoing mission to offer customers expert advice in choosing and purchasing the right technology for their specific needs. CDW has technology specialty teams in nine different areas including networking, wireless, security and storage. "We've been very happy with the depth of technical advice and support we've received from CDW's technology specialists," said David Kennedy, Director of Information Technology at Stone Energy Corporation, a leading independent oil and gas company. "CDW works closely with our team to help us make sure the Cisco products and services we use function well in our technology environment." "We continue to enjoy a great relationship with Cisco," said Jim Grass, CDW senior director of sales. "There are significant opportunities to help customers apply technology that can aid them in accomplishing business objectives." Cisco recently named CDW its National Reseller of the Year for the Direct Marketing Reseller channel in 2003, the second consecutive year CDW earned this honor. About CDW Technology Specialty Teams CDW's certified technology specialists provide solution design and other technical advice to customers online and on the phone everyday. The CDW@work extranet programs provide customers with web-based tools that include a purchase authorization system, downloadable purchase history, online quote retrieval and a detailed order status system. The specialty teams are: Bandwidth Mobility/Wireless Networking LAN/WAN Power Security Storage Technology Services Telephony Volume Software Licensing About CDW CDW® (Nasdaq: CDWC), ranked No. 376 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 APC, Apple, Cisco, HP, IBM, Microsoft, Sony, Symantec, Toshiba and ViewSonic. CDW distributes contracts to end users for customized and standardized on-site services supplied directly by providers such as HP Services and Unisys and for training programs provided by firms such as KnowledgeNet and Productivity Point International. CDW was founded in 1984 as a home-based business and today employs approximately 3,700 coworkers. In 2003, the company generated net sales of approximately $4.7 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™ 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 more than 100 factory-trained and A+ certified technicians on staff. Additional information can be found by visiting CDW.com.