CacheFlow Licenses Windows Media Technology from Microsoft.

Business Editors/High-Tech Writers

SUNNYVALE, Calif.--(BUSINESS WIRE)--Dec. 12, 2001

CacheFlow(R) Inc. (Nasdaq:CFLO), the leading provider of content-smart networking solutions, today announced a comprehensive agreement with Microsoft to integrate Windows Media(TM) Technologies within CacheFlow's cIQ(TM) Content Delivery Solutions. The agreement provides for the licensing, development and distribution of Windows Media Technologies with CacheFlow Content Accelerators, enabling on demand and live streaming solutions for organizations delivering multimedia content to end users. Additionally, CacheFlow has commenced certification testing with Microsoft to ensure the latest product versions meet the rigorous interoperability and performance standards defined by the agreement. As a result, service providers and enterprises now have comprehensive support for cost-effective, high-quality delivery of executive webcasts, e-Learning and other streaming applications across their Content Delivery Networks (CDNs).

"Streaming media is rapidly becoming a strategic capability of the network infrastructure," said Jonathan Usher, group product manager, Microsoft Corporation. "And CacheFlow's support for Windows Media's industry leading audio and video technology bolsters our already broad industry support to enable public and private CDNs to intelligently deliver business and consumer-oriented content based on Windows Media Technologies."

"CacheFlow's agreement with Microsoft is designed to provide companies with a turn-key infrastructure solution for delivering multimedia applications to users," said Charles Dauber, vice president of Product Marketing and Management at CacheFlow. "As an integral component of our cIQ Content Delivery Architecture, enterprise and service provider customers can easily integrate their Microsoft environments with the CacheFlow content delivery network to reduce infrastructure costs and ensure rapid deployment of high-quality audio and video to the network edge."

CacheFlow content delivery solutions are based upon the cIQ Content Delivery Architecture -- a comprehensive system that enables enterprises and service providers to deploy emerging streaming applications on existing network infrastructure. The architecture combines the reliability and ease-of-use of content acceleration appliances with a powerful content distribution and management platform called cIQ Director. Together, they represent the essential ingredients of a content-smart network for accelerating, managing, and distributing static, streaming, and application content to employees and subscribers. The architecture allows organizations to cost effectively deploy multimedia applications and fully manage where, when and how multimedia content gets populated to the network edge, ensuring existing services are unaffected and providing a high Quality of Experience for users.

About CacheFlow Inc.

CacheFlow is focused on content-smart networking -- a new layer of infrastructure for intelligently accelerating, delivering, and managing static, streaming, and dynamic content. CacheFlow's market-leading appliances and innovative cIQ content delivery technologies enable enterprises, service providers and content delivery network providers to deliver the right content to the right place at the right time. Based in Sunnyvale, Calif., CacheFlow can be contacted via telephone at 408/220-2200, fax at 408/220-2250 or email at [e-mail].

Forward Looking Statements

The statements contained in this press release that are not purely historical are forward-looking statements, including statements regarding CacheFlow's market position within the content-smart networking industry, anticipated product features and functionality, as well as our expectations, beliefs, intentions or strategies regarding the future. All forward-looking statements included in this press release are based upon information available to CacheFlow as of the date hereof, and CacheFlow assumes no obligation to update any such forward-looking statements. Forward-looking statements involve risks and uncertainties, which could cause actual results to differ materially from those projected. These and other risks relating to CacheFlow's business are set forth in CacheFlow's Form 10-Q for the quarter ended July 31, 2001, and CacheFlow's Form 10-K for the year ended April 30, 2001, and other reports filed from time to time with the Securities and Exchange Commission.

Note to Editors: CacheFlow is a registered trademark of CacheFlow Inc. in the U.S. and worldwide. All other trademarks mentioned in this document are the property of their respective owners.

Microsoft, Windows and Windows Media are either registered trademarks or trademarks of Microsoft Corp. in the United States and/or other countries.