Tumbleweed Expands Customer Advisory Board

Program Fosters Closer Communication with Executives at Industry-Leading Companies

REDWOOD CITY, CA - September 20, 2002 - Tumbleweed® Communications Corp.(Nasdaq:TMWD - News), leading provider of secure messaging applications for businesses using the Internet, today announced the expansion of its Customer Advisory Board. The board meets twice a year and was formed to open a dialogue on key secure communications issues with key executives at some of the world's leading companies. The most recent meeting took place September 17-18, 2002 at the Ritz Carlton in Half Moon Bay, California.

Tumbleweed customers selected to join the Customer Advisory Board serve a one-year term. New members include representatives from the following companies: American Century Investment Services, Inc., Amgen Inc., Bank of America Securities, Mutual of Omaha Insurance Company, National City Corporation, Oppenheimer Funds, Inc., The Regence Group (Blue Cross/Blue Shield), and TD Waterhouse Investor Services, Inc.

"Participating on the Customer Advisory Board helps me maximize my company's investment in Tumbleweed," said Christopher Bradish, Chief Technologist of Amgen Inc. "By talking with other executives grappling with similar issues around managing and securing the email communication channel, I left the meetings with valuable insights into automating our business processes. I commend Tumbleweed for taking such an active interest in its customers and appreciate the value this forum offers us."

In this week's meetings, Tumbleweed executives presented results from the latest Customer Satisfaction survey, conducted semi-annually, and progress on the resulting action plans. Customer Advisory Board members also participated in sessions addressing Tumbleweed's long-term roadmap and strategic direction.

"The input of our Customer Advisory Board members is invaluable," said Jeff Smith, Tumbleweed's Co-Founder, Chairman and Chief Executive Officer. "We appreciate the time and ideas our customers have contributed for these mutually beneficial sessions."

About Tumbleweed
Tumbleweed is a leading provider of secure messaging solutions for businesses using the 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, Chevron, Datek Online, the European Union's Joint Research Council, First Union Wachovia, John Deere, Merrill Lynch, Nike, Northern Trust, NTT, Salomon Smith Barney, Travelers and the U.S. Food and Drug Administration. One hundred of the Fortune 500 are Tumbleweed customers. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, California.

Tumbleweed cautions that forward-looking statements contained in this press release are based on current plans and expectations, and that a number of factors could cause the actual results to differ materially from the forward-looking statements made at this time. These factors are described in the Safe Harbor statement below. Tumbleweed undertakes no obligation to update this press release or statement about matters mentioned therein at any time, during the current quarter or in future quarters.

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 Tumbleweed's customers, product plans and strategic plans. 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, 2002 and Form 10-Q filed August 14, 2002. Tumbleweed assumes no obligation to update information contained in this press release.