Tumbleweed to Present at Security Research Associates' Third Annual Summer Growth Stock Conference

Tumbleweed® Communications Corp. (NASDAQ:TMWD), a leading provider of messaging security products, will be presenting at Security Research Associates’ Third Annual Summer Growth Stock Conference at the Omni Hotel in San Francisco on Monday, July 30, 2007 at 8:00 a.m. PDT. Tim Conley, Chief Financial Officer of Tumbleweed, will discuss the Company’s market positioning and growth strategies. A live audio webcast of the presentation will be broadcast at the following link: http://www.wsw.com/webcast/sra5/tmwd/. This link will also access a replay of the webcast approximately two hours after the presentation ends and will be available for the following 90 days. The webcast link and replay will also be made available on Tumbleweed’s website in the investor relations section of the site at: http://www.tumbleweed.com. Safe Harbor Statement Tumbleweed cautions that forward-looking statements contained in this press release are based on plans and expectations as of the date of the press release, and that a number of factors could cause the actual results to differ materially from the guidance given at this time. These factors are described in the Safe Harbor statement below. 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 participation in the Security Research Associates’ Third Annual Summer Growth Conference, the participation of any specific Tumbleweed employee at the conference, and the subject matter of Tumbleweed’s presentations at the conference. 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 14, 2007 and Form 10-Q filed May 10, 2007. Tumbleweed assumes no obligation to update information contained in this press release. Although this release may remain available on Tumbleweed’s website or elsewhere, its continued availability does not indicate that Tumbleweed is reaffirming or confirming any of the information contained herein. About Tumbleweed Tumbleweed Communications Corp. (NASDAQ:TMWD), the industry's leading pure play messaging security vendor, provides world-class innovative messaging security solutions for organizations of all sizes. Organizations rely on Tumbleweed's solutions to securely manage their Internet communications, spanning email management to file transfers. Tumbleweed has nearly 2,700 customers worldwide, representing industries such as Finance, Healthcare, and the U.S. Government. The world's most security conscious organizations rely upon Tumbleweed technology including Bank of America Securities, JP Morgan Chase & Co., the U.S. Food and Drug Administration, and the U.S. Department of Defense. Our award-winning products build on fourteen years of R&D and 26 security patents in the U.S. alone - many of which are licensed by other security vendors. More information can be found at www.tumbleweed.com. Tumbleweed is a registered trademark of Tumbleweed Communications Corp. in the United States and/or other countries. All other trademarks are the property of their respective owners.