Tumbleweed Launches Channel Alliance Program

Program Delivers Significant Benefits to Information Systems & Security Specialists

REDWOOD CITY, CA - June 28, 2001 - Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of mission critical messaging software, today announced that it has launched the Tumbleweed Channel Alliance Program, a structured, multi-tiered program designed for IT consulting specialists and resellers pursuing revenue opportunities in the enterprise security and messaging software market.

"The Tumbleweed Channel Alliance Program offers an opportunity to capitalize on the growing security market space with an established, robust product line from a proven market leader," said Robert Krauss, Vice President of Channel Development at Tumbleweed Communications Corp. "We are committed to our channel partners and have designed our alliance program to generate revenue opportunities for our partners and increase Tumbleweed's sales coverage to meet the demand for enterprise security solutions built on Tumbleweed software."

Tumbleweed software is designed to allow organizations to apply security beyond the firewall and secure email and Web traffic. Tumbleweed provides a complete range of secure email solutions, including virus scanning, content control, access control, encryption, and authentication. Tumbleweed's products integrate with existing email networks and provide security for business communications using multiple layers of security and cryptography.

Partners in the Tumbleweed Channel Alliance Program range from information security and networking specialists to eBusiness consultants. Some initial partners include:

• Icons Inc. concentrates on all aspects of information security from security requirements assessment to policy and procedure development for customers in the financial services, electronics, telecommunications and petroleum industries.



• IPM provides medium-to-large businesses with thin client, secure information access and network services solutions.



• Kraft, Kennedy & Lesser, Inc. provides a comprehensive suite of consulting and network integration services for law firms and corporate legal departments.



• Neoteric, Inc. provides a complete range of services including audit, policies, development, architecture, and implementation and customers range from government agencies to Fortune 100 companies.

"We're pleased to be a partner in the Tumbleweed Channel Alliance Program," said Paul Rohmeyer, Chief Operating Officer of Icons, Inc. "Tumbleweed's product suite provides our customers with the right tools to manage and enable email communications while protecting their enterprise network environment with multiple layers of security. We've had the pleasure of working with Tumbleweed already in some key customer accounts and we're looking forward to expanding our relationship under this new program."

The Tumbleweed Channel Alliance Program
The Tumbleweed Channel Alliance Program is a structured, multi-tiered channel program designed for IT consulting specialists pursuing revenue opportunities in the enterprise security and messaging software market. The program provides increasing levels of sales promotions, opportunities and technical support for Tumbleweed partners according to their commitment to Tumbleweed and value-add offered to the customer. The sales success of Tumbleweed partners will be monitored to identify opportunities for sponsorship into other program levels. More information on the Tumbleweed Channel Alliance Program can be found on the Tumbleweed Web site, located at www.tumbleweed.com where information is available to those interested in joining the program.

About Tumbleweed
Tumbleweed Communications (NASDAQ: TMWD) is a leading provider of mission critical messaging software that enables organizations to manage and secure online business communications and processes. Tumbleweed's customers use the company's solutions to define secure communication networks, to centrally control and monitor the corporate communications stream and to create a foundation for automated preparation and secure Internet delivery of sensitive business information. Companies that rely on Tumbleweed Communications solutions include American Express, Chase Manhattan Bank, Chevron, Datek Online, the European Union's Joint Research Council, FDA, 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. More information can be found at www.tumbleweed.com.

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.