F5 and Reactivity Form Global Strategic Alliance; Partnership Enables Enterprises to Easily Leverage F5's Market-Leading Application Delivery Networking Products with Reactivity's Best-in-Class XML Networking Products.

SEATTLE -- Companies Announce Plans for Joint Deployments and Product Integration

E[acute accent]F5 Networks, Inc. (NASDAQ: FFIV), the global leader in Application Delivery Networking and Reactivity, Inc., the leading independent XML Enabled Networking provider, today announced a global strategic alliance. The purpose of the alliance is to augment F5's solution set with a best-of-breed product for customers who require specialized management of their XML-based applications, such as Web services. Through this partnership agreement, F5 and Reactivity will work together to address the requirements of this important and growing segment of the market. E[acute accent]"We're excited to closely partner with Reactivity," said Dan Matte, SVP of Marketing at F5 Networks. "F5 has established solid leadership in the overall market for Application Delivery Networking, but some specialized applications such as Web services require deeper XML expertise. Reactivity offers an excellent solution to provide this functionality to F5 customers." E[acute accent]"We're pleased to be strategically partnering with the market leader and innovator in Application Delivery Networking whose advanced TMOS architecture has set the bar for injecting intelligence into the network," said Glenn Osaka, CEO of Reactivity, Inc. "Our solutions are a perfect fit with F5 products today; offering the common objective of helping enterprises realize the promise of XML Web services and application-fluent networking." E[acute accent]Beginning immediately, F5 and Reactivity will begin joint engagements to provide enterprise-class solutions to their customers. Going forward, the Companies intend to offer jointly-developed solutions, leveraging F5's iControl(R) API and TMOS architecture.

E[acute accent]About F5 Networks

E[acute accent]F5 Networks is the global leader in Application Delivery Networking. F5 provides solutions that make applications secure, fast and available for everyone, helping organizations get the most out of their investment. By adding intelligence and manageability into the network to offload applications, F5 optimizes applications and allows them to work faster and consume fewer resources. F5's extensible architecture intelligently integrates application optimization, protects the application and the network, and delivers application reliability - all on one universal platform. Over 10,000 organizations and service providers worldwide trust F5 to keep their applications running. The company is headquartered in Seattle, Washington with offices worldwide. For more information, go to www.f5.com.

E[acute accent]About Reactivity

E[acute accent]Reactivity provides the leading XML networking products used by enterprises to XML enable their networks and realize the promise of XML messaging and Web services. Reactivity's family of products enables businesses to secure, accelerate and route XML traffic effectively in order to expedite services, time-to-market and gain competitive advantage. Reactivity has unique experience with major Global 2000 enterprises in financial services, publishing, travel and other industries and is an active member of Liberty Alliance, OASIS and WS-I. Reactivity is located in Belmont, California, and can be reached at www.reactivity.com, [phone] or [e-mail].

E[acute accent]This press release may contain forward looking statements relating to future events or future financial performance that involve risks and uncertainties. Such statements can be identified by terminology such as "may," "will," "should," "expects," "plans," "anticipates," "believes," "estimates," "predicts", "potential" or "continue" or the negative of such terms or comparable terms. These statements are only predictions and actual results could differ materially from those anticipated in these statements based upon a number of factors including those identified in the Company's filings with the SEC.