Christopher Greendale Joins Tumbleweed Board of Directors

REDWOOD CITY, CA - August 17, 2001 - The Board of Directors of Tumbleweed Communications Corp (NASDAQ:TMWD), a leading provider of secure content management solutions for enabling the business Internet, announced today that Christopher H. Greendale, Chairman of Metatomix, Inc. has been elected to serve on Tumbleweed's Board of Directors.

Greendale brings a great depth of experience in the software and consulting industry to Tumbleweed. He was co-founder of Cambridge Technology Partners, a strategic and management consulting company that provides eBusiness systems integration services. At Cambridge, Greendale served as head of sales and marketing for over six years and grew the company to over $600 million in annual revenues. Cambridge was recently acquired by Novell, Inc.

"As we focus on ramping our Channel Alliance program through strategic partnerships, Chris' extensive experience in systems integration and software consulting make him an invaluable addition to our Board," said Jeffrey C. Smith, Chairman and CEO of Tumbleweed Communications Corp. "The combined experience and strength of Tumbleweed's Board and our new executive management team positions us well to continue to grow our revenue base, scale our organization intelligently and capture the tremendous market opportunity for Tumbleweed solutions. According to a recent IDC report, the market for secure content management solutions is expected to reach $4 billion by 2005."

"The solutions that Tumbleweed offers are critical to enterprises looking to enable the business Internet with a policy-based, secure framework that allows them to manage all of their online communications and processes," said Christopher H. Greendale, Chairman of Metatomix, Inc. "I'm looking forward to working with the entire board to help guide Tumbleweed's success and make our solutions ubiquitous throughout the global markets we serve."

Currently, Greendale is Chairman of Metatomix, Inc., a provider of database connector software for enterprises. In addition, through his venture investing firm, he is Vice-Chairman and serves on the board of directors of a number of early stage systems integration and software companies.

About Tumbleweed
Tumbleweed is a leading provider of solutions for managing secure communication and collaboration to enable the business Internet. Tumbleweed's robust policy-based framework empowers organizations to safely share and protect critical information, increase customer loyalty and privacy and dramatically reduce costs. Tumbleweed is trusted by 1,000 blue-chip customers including American Express, JP Morgan Chase & Co., Chevron, Datek Online, the European Union's Joint Research Council, US Food and Drug Administration, John Deere, Merrill Lynch, Nike, Northern Trust, NTT, Salomon Smith Barney, Travelers, United Parcel Service, and seven of the world's largest postal services. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, CA with offices around the world.

Except for the historical information contained herein, the matters discussed in this press release may constitute forward-looking statements that involve risks and uncertainties that could cause actual results to differ materially from those projected, particularly with respect to the security features of Tumbleweed's products and the activities of any third party. In some cases, forward-looking statements can be identified by terminology such as "may," "will," "should," "potential," "continue," "expects," "anticipates," "intends," "plans," "believes," "estimates," and similar expressions. For further cautions about the risks of investing in Tumbleweed, we refer you to the documents Tumbleweed files from time to time with the Securities and Exchange Commission, particularly Tumbleweed's Form 10-K filed March 30, 2001 and Form 10-Q filed November 13, 2001. Tumbleweed assumes no obligation to update information contained in this press release.