Tumbleweed's Innovative Messaging Solution Enables High Volume Digital Archiving

REDWOOD CITY, CA - January 18, 2001 - Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of mission critical messaging solutions, today announced the release of Tumbleweed Messaging Management System&153; (MMS™) Message Monitor 4.7. Tumbleweed's newest messaging management product, MMS Message Monitor 4.7 provides email archiving, monitoring and reporting capabilities that enable brokerage and investment firms to comply with both corporate and regulatory guidelines, such as the SEC's regulations governing archiving email messages.

Six of the top ten brokerage firms in the United States use Message Monitor 4.7 to manage digital archiving, scalability, monitoring and reporting on email traffic. Message Monitor works in conjunction with Tumbleweed MMS to secure, monitor and manage the email communication stream between brokers, partners and customers on the Internet. The new Message Monitor 4.7 increases Message Monitor digital archiving capacity by approximately 60%. With this enhanced capacity, customers who deploy Message Monitor 4.7 can archive over 2 million email messages per workday. Message Monitor also provides an indexed database for quick retrieval of messages, browser-based interface and tiered reviewer structure. This allows supervisors, compliance officers and auditors to review and act on email messages, providing complete visibility into the corporate communication stream.

"Tumbleweed has always made a commitment to be proactive and stay in front of our customers' requirements," said Kerry Champion, Senior Vice President, Product Development, Tumbleweed Communications Corp. "The substantially increased scalability of Message Monitor 4.7 is an important step toward fulfilling that commitment. Another step is continued investment in our products and technology, which includes increasing our budget for research and development spending in 2001 over 2000."

Tumbleweed Message Management System (MMS)™
Tumbleweed MMS provides a complete set of email management solutions enabling companies to set policies by applying content control, encryption, access control, attachment management, virus scanning and digital signatures to email traffic that are administered centrally and enforced universally across an enterprise. MMS 4.7, the companion product to Message Monitor 4.7, was shipped in October 2000.

About Tumbleweed Communications Corp.
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, 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 US 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, Calif., 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.