C1 Communications Implements CacheFlow Internet Caching Appliances to Help Business Customers Enjoy Full Benefit of Internet Performance over DSL.

Business Editors/Technology Writers

SUNNYVALE, Calif.--(BUSINESS WIRE)--March 13, 2000

CacheFlow Solution Also Positions C1 Communications'

Infrastructure to Accommodate Surges without Performance Degradation

CacheFlow(R) Inc. (NASDAQ: CFLO), a leading provider of Internet caching appliances, today announced that C1 Communications, a next-generation communication company based in New Brunswick, Canada, is deploying CacheFlow Internet caching appliances in its network hubs to ensure optimal Internet performance for subscribers to its digital subscriber line (DSL) services. C1 Communications, one of the first service providers to offer DSL to enterprise customers in Canada, selected CacheFlow because of its proven ability to cut Internet response times, as well as the ease of installation and maintenance of its appliances.

"Every element of our network infrastructure reflects our understanding of what our enterprise customers have told us they need to prosper, and the CacheFlow appliance is no exception," said A. S. (Tony) Cassetta, president and COO, C1 Communications (www.c1communications.com). "The CacheFlow solution is designed specifically to deliver accurate Internet content more quickly, and businesses in every industry can easily measure the economic benefit of that capability. The CacheFlow appliances afford us a critical competitive differentiator."

C1 Communications offers businesses economical and easy-to-implement data and integrated telephony services over DSL. CacheFlow appliances locally store and serve the Internet content most often requested by C1 Communications' subscribers, while simultaneously monitoring the source of that content for changes. In doing so, CacheFlow's operating system, CacheOS(TM), and custom hardware cut Internet response times without sacrificing content freshness. By installing CacheFlow appliances in its hubs, C1 Communications optimizes its customers' Internet performance to deliver the full benefits of DSL connectivity.

C1 Communications can also more efficiently utilize its own links to the wide-area network because subscriber requests for Internet content are often satisfied locally by the CacheFlow cache. This helps C1 Communications' infrastructure better handle usage spikes and traffic growth as more businesses subscribe to the company's services.

"C1 Communications has constructed a state-of-the-art network that effectively guarantees its business customers access to leading-edge, customized technology solutions," said Stu Aaron, vice president of product management at CacheFlow. "Our Internet caching appliances are an ideal fit for their business model. Our solution was engineered with an understanding of the growing dependence on high-speed data communications and lack of tolerance for networking delays."

About CacheFlow Inc.

CacheFlow is a leading provider of Internet caching appliances that accelerate and manage the flow of information over the Internet. CacheFlow solutions -- containing the CacheOSTM operating system -- boost the performance of e-commerce Web sites, enhance the productivity of Internet users and reduce overall network costs for Internet service providers and enterprises. In addition, CacheFlow Internet caching appliances are designed to provide better network security and more up-to-date content than traditional caching solutions. Based in Sunnyvale, California, CacheFlow can be contacted via telephone at [phone], fax at [phone] or email at [e-mail]. Investors and financial analysts may contact CacheFlow Investor Relations at [phone]. For more information, visit www.cacheflow.com.

The statements contained in this press release that are not purely historical are forward-looking statements, including statements regarding CacheFlow's 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 S-1, as amended and declared effective by the Securities and Exchange Commission on November 18, 1999, the Form 10-Q for the period ended October 31, 1999, and other reports filed from time to time with the Securities and Exchange Commission.

CacheFlow is a registered trademark of CacheFlow Inc. in the U.S. and worldwide. All other company and product names are used for identification purposes only and may be trademarks of their respective owners