Tumbleweed Communications Corp. (TMWD)

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U.S. Patent & Trademark Office Grants Tumbleweed a New Email Firewall Patent
Wednesday May 28, 5:00 pm ET

REDWOOD CITY, Calif., May 28 /PRNewswire-FirstCall/ -- Tumbleweed® Communications Corp. (Nasdaq: TMWD - News), a leader in managed file transfer and email security, today announced that it has been granted U.S. Patent No. 7,380,274 by the U.S. Patent and Trademark Office.

The new patent, titled "Email Firewall" describes the enforcement of multiple administrator-selected policies to email traffic entering or leaving an organization. The new patent is a continuation of U.S. Patent No. 7,162,738, which is itself a continuation of Patent No. 6,609,196, which claims priority to an application filed on July 24, 1997.

Tumbleweed's patent portfolio, which broadly covers secure communication over Internet standards, includes 29 granted U.S. utility patents.

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 the development and enforcement of the Tumbleweed patent portfolio. 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 17, 2008 and Tumbleweed's Form 10-Q filed May 12, 2008.

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 - News), an industry leader in managed file transfer and email security, provides enterprise-class solutions to organizations of all sizes. Tumbleweed's innovative products enable organizations to effectively manage and protect business-critical Internet communications, with capabilities that span secure file transfer, encryption, data loss prevention, and email security. Tumbleweed has more than 3,200 customers worldwide, including blue-chip companies across an array of industries such as technology, retail, finance, healthcare, manufacturing, consumer packaged goods, telecom, energy, 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 15 years of R&D and 29 security patents in the U.S. alone -- many of which are licensed by other security vendors. More information can be found at http://www.tumbleweed.com.

Tumbleweed is a registered trademark or trademark of Tumbleweed Communications Corp. in the United States and/or other countries. All other trademarks are the property of their respective owners.

Press contact:
Dan Gould
SHIFT Communications for Tumbleweed
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