Tumbleweed Webcast to Address PCI Compliance for Payment Card Data in Advance of October 1 Deadline

What: Tumbleweed(R) Communications Corp. (NASDAQ:TMWD), an industry leader in managed file transfer and content security, is hosting a webcast PCI Compliance for Data in Motion. The webcast will review how to protect payment card data, transmitted via email and file transfer, now protected under PCI Data Security Standards enforceable as of October 1, 2007.

Further, the webcast will address:

-- The 12 requirements of the PCI Data Security Standard

-- Major factors to consider when protecting card data in motion

-- Threats impacting security of payment card info during transmission

-- Implementation of true compliance, versus "checkbox" activities leaving organizations open to risk

-- Linking business processes and communication channels to PCI

When: The one-hour online webinar will take place on Thursday, September 6, 2007 at 11:00 am PT/2:00 pm ET.

Registration: Additional details and registration information can be found at http://tumbleweed.com/

Why: With every payment card transaction involving up to a dozen different companies, the PCI Data Security Standard was developed as a protection measure against damaging and costly data breaches that could occur during the complicated transaction process. Merchants, payment processors, banks, and service providers must now comply with these new, comprehensive standards of protecting payment card data by October 1, 2007 or they will begin to face fines and increased transaction costs. This webcast is essential for those tasked with ensuring electronic communications are in compliance with PCI Data Security Standards by October 1, 2007.

About the presenter:

Dan Maier is the senior director of product marketing at Tumbleweed. He has nearly 20 years of experience in driving product and corporate strategy, and depth of experience in developing and delivering security products for public and private companies.

A member of the PCI Security Standards Council, Tumbleweed is relied upon by the world's most security conscious organizations. Since 1993, Tumbleweed has been protecting "data in motion" with sophisticated data leak prevention and secure file transfer products. Built to scale with evolving compliance and regulatory needs, Tumbleweed's pragmatic, business-friendly solutions are designed to improve productivity and reduce risk for enterprises of all sizes. Our customers include industry leaders in retail, financial services, travel & entertainment, technology, healthcare, government and more. More information can be found at 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 the participation of any specific Tumbleweed employee in the PCI Compliance for Data in Motion webinar, as well as the content of the webinar. 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 August 7, 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 more than 2,900 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 27 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.