Tumbleweed Gains Market Share in Recent IDC Report On Secure Content Management

IDC Reports Tumbleweed's Significant Market Share Increase

REDWOOD CITY, CA - September 4, 2001 - Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of secure content management solutions for enabling the business Internet, announced today that its market share in the worldwide email scanning market increased to 24% in 2000 from 15% in 1999, according to a recent report on secure content management (SCM) released by IDC. According to IDC, total revenue in the email scanning market was $101.4 million in 2000 and email scanning is the fastest growing segment of the SCM market, which also includes antivirus, Internet access control, employee Internet management and malicious mobile code. The total SCM market is expected to grow to $4.2 billion by 2005 from $1.7 billion in 2000. Tumbleweed offers a broad range of solutions that address all of the segments within the secure content management market.

Secure content management is a new market established by IDC that demonstrates corporate customers' need for an Internet management tool that controls Web content, email scanning, virus protection and downloadable applications execution. Customers are increasingly looking to cut costs and become more security proficient,'' said Brian Burke, senior research analyst in IDC's security group. ``Considering the complexity of data moving across the Internet, SCM software, like Tumbleweed's, that provides a single point of administration and policy management for enterprise content security can enable companies to build trusted relationships with customers, partners, suppliers and channels while they cut costs and increase productivity."

"We're pleased with our significant market share increase as reflected in the new report, and with IDC's acknowledgement of the growing importance of SCM solutions to Global 2000 enterprises," said Jeff Smith, Chairman and CEO of Tumbleweed Communications Corp. ``We are achieving our growth during a turbulent worldwide IT spending environment, which demonstrates that our vision to enable the enterprise to manage information flow and security applications from a single, policy-based framework is aligned with our customer's spending priorities. Tumbleweed offers a compelling value proposition for organizations that want to combine a comprehensive information security solution with the efficiencies and cost-savings of extending their networks by moving paper-based processes online."

Tumbleweed solutions offer customers a centralized security and policy framework for information flow leaving and entering the enterprise. Using Tumbleweed, enterprises can manage all of their security applications, protect their internal networks, and manage and secure web content and email communications. Enterprises can use Tumbleweed solutions to extend communications beyond their networks and deliver and exchange content with customers, partners and suppliers using a secure, reliable and auditable platform. Because Tumbleweed solutions are application-independent, they can integrate with existing infrastructure and enable customers to consolidate and universally apply two-way security policies across their entire enterprise.

"Customer demand is exploding for SCM products that protect corporate networks and intellectual property from virus attacks and malicious mobile code," added Christian C. Christiansen, Vice President of IDC's security group. ``We believe demand is emerging for SCM software that provides one centralized solution to identify e-commerce objects which contain transaction or customer information, authenticates both the user and the transaction, and analyzes content, so that various parts of messages can be routed more effectively and securely."

About Tumbleweed
Tumbleweed is a leading provider of solutions for managing secure communication and collaboration to enable the business Internet. Tumbleweed's robust policy-based framework empowers organizations to safely share and protect critical information, increase customer loyalty and privacy and dramatically reduce costs. Tumbleweed is trusted by 1,000 blue-chip customers including American Express, JP Morgan Chase & Co., Chevron, Datek Online, the European Union's Joint Research Council, US Food and Drug Administration, John Deere, Merrill Lynch, Nike, Northern Trust, NTT, Salomon Smith Barney, Travelers, United Parcel Service, and seven of the world's largest postal services. Tumbleweed Communications was founded in 1993 and is headquartered in Redwood City, CA with offices around the world.

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 security features of Tumbleweed's products and the activities of any third party. 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 30, 2001 and Form 10-Q filed November 13, 2001. Tumbleweed assumes no obligation to update information contained in this press release.