Tumbleweed Names Daniel Greenberg Chief Marketing Officer; Technology Industry Veteran to Focus on Market Expansion Strategy and Increasing the Company's Global Brand Awareness

Greenberg brings nearly two decades of leadership experience inbranding, marketing, and delivering world class products to market.Prior to joining Tumbleweed, Greenberg was vice president of worldwidemarketing and product management at Macrovision's software technologygroup. Before Macrovision, Greenberg was a founder and vice presidentof marketing and product management at Active Decisions and beforethat he was vice president global marketing for ACNielsen. Greenberghas also held strategic marketing positions with Dun & Bradstreet andGeneral Motors.

"We're excited to have Daniel on board and are confident thathe'll make a significant impact on our brand awareness and globalvisibility," said Jim Scullion, president and chief executive officerof Tumbleweed. "Daniel has a strong track record of marketingsuccesses and brings the mix of market strategy expertise, broadexperience, and technical knowledge we've been looking for."

"Tumbleweed is facing an enormous opportunity with a customer listthat boasts 9 of the 10 top financial institutions in the world --those with the most demanding security requirements. My due diligencewith customers and industry experts revealed a high level ofsatisfaction. Tumbleweed's products are considered truly'best-in-class'," said Greenberg. "I look forward to working with whatis already a strong marketing team to help create an even greaterpresence for the Tumbleweed brand."

Greenberg received his M.B.A. with honors from University ofChicago Graduate School of Business, as well as his B.A. in economicsfrom Oberlin College.

SAFE HARBOR STATEMENT

Tumbleweed cautions that forward-looking statements contained inthis press release are based on current plans and expectations as ofthe date of this press release, and that a number of factors couldcause the actual results to differ materially from the guidance givenat this time. These factors are described in the Safe Harbor statementbelow.

Except for the historical information contained herein, thematters discussed in this press release may constitute forward-lookingstatements that involve risks and uncertainties that could causeactual results to differ materially from those projected, particularlywith respect to Tumbleweed's brand awareness, brand presence, andglobal visibility. In some cases, forward-looking statements can beidentified by terminology such as "may," "will," "should,""potential," "continue," "expects," "anticipates," "intends," "plans,""believes," "estimates," and similar expressions. For further cautionsabout the risks of investing in Tumbleweed, we refer you to thedocuments Tumbleweed files from time to time with the Securities andExchange Commission, particularly Tumbleweed's Form 10-K filed March16, 2006.

Tumbleweed assumes no obligation to update information containedin this press release. Although this release may remain available onTumbleweed's website or elsewhere, its continued availability does notindicate that Tumbleweed is reaffirming or confirming any of theinformation contained herein.

About Tumbleweed Communications Corp.

Tumbleweed provides security solutions for email protection, filetransfers, and identity validation that allow organizations to safelyconduct business over the Internet. Tumbleweed offers these solutionsin three comprehensive product suites: MailGate(R),SecureTransport(TM), and Validation Authority(TM). MailGate providesprotection against spam, viruses, and attacks, and enablespolicy-based message filtering, encryption, and routing.SecureTransport enables business to safely exchange large files andtransactions without proprietary software. Validation Authority is theworld-leading solution for determining the validity of digitalcertificates. Tumbleweed's enterprise and government customers includeABN Amro, Bank of America Securities, Catholic Healthcare West, JPMorgan Chase & Co., The Regence Group (Blue Cross/Blue Shield), St.Luke's Episcopal Healthcare System, the U.S. Food and DrugAdministration, the U.S. Department of Defense, and all four branchesof the U.S. Armed Forces. Tumbleweed was founded in 1993 and isheadquartered in Redwood City, Calif. For additional information aboutTumbleweed go to www.tumbleweed.com or call 650-216-2000.

Tumbleweed, the Arrows logo, MailGate, SecureTransport andValidation Authority are either registered trademarks or trademarks ofTumbleweed Communications Corp. in the United States and/or othercountries. All other trademarks are the property of their respectiveowners.