Tumbleweed Licenses Email Firewall Patents to Vircom

Vircom, leading developer of secure email management andauthentication solutions, has licensed Tumbleweed U.S. Patent No.6,609,196 titled "Email Firewall with Stored KeyEncryption/Decryption" and Patent No. 6,393,568 titled "Encryption andDecryption Method with Content Analysis Provision," and has obtainedan option to license additional Tumbleweed patents.

"Vircom is always on the forefront of innovation, so it is normalthat we avoid any legal hurdles that could prevent us from bringing toour customers the widest array of features available on the market,both today and tomorrow," commented Sylvain Durocher, president andfounder of Vircom.

"We're pleased to assist Vircom in bringing a broader choice offeatures through our licensed patents," said Craig R Brennan,Tumbleweed's CEO and chairman. "We will always continue to develop andinnovate for the industry."

Terms of the agreement were not disclosed.

About Tumbleweed Communications Corp.

Tumbleweed provides security software and appliances for emailprotection, file transfers, and identity validation that alloworganizations to safely conduct business over the Internet. Tumbleweedoffers these solutions in three comprehensive product suites:MailGate, SecureTransport, and Validation Authority. 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.

About Vircom

Montreal-based Vircom is a leading developer of secure emailmanagement and authentication solutions for the demanding needs ofInternet Service Providers and SMBs. Vircom's mature Modus(TM) secureemail management technology incorporates over 10 years of industryexpertise, making it a powerful driving force in the defense againstspam and email-borne fraud. Modus has gained important industryrecognition, including a record-breaking five-award distinction fromWindows IT Pro magazine. For more information, please visitwww.vircom.com.

SAFE HARBOR STATEMENT

Tumbleweed cautions that forward-looking statements contained inthis press release are based on plans and expectations as of the dateof the press release, and that a number of factors could cause theactual results to differ materially from the guidance given at thistime. These factors are described in the Safe Harbor statement below.

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 the development and enforcement of the Tumbleweedpatent portfolio. 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, 2005 and Form 10-Q filed August 9, 2005.

Tumbleweed assumes no obligation to update information containedin this press release, which represents the Company's expectationsonly as of the date of this release and should not be viewed as astatement about the Company's expectations after such date. Althoughthis release may remain available on the Company's website orelsewhere, its continued availability does not indicate that theCompany is reaffirming or confirming any of the information containedherein.