LabOne Selects Tumbleweed MMS to Secure Online Communications for Their Enterprise Network

REDWOOD CITY, CA - July 2, 2001 - Tumbleweed® Communications Corp. (Nasdaq:TMWD), a leading provider of mission-critical messaging software, today announced that LabOne, Inc. (NASDAQ: LABS), the nation's leading provider of high-quality laboratory testing, investigative services and paramedical examinations for insurance and healthcare industries, and substance abuse testing services for employers, has chosen Tumbleweed Messaging Management System™ (MMS™) to provide a comprehensive Internet security and email management solution between its employees, partners and customers.

Tumbleweed MMS is a set of email management products and services that enables LabOne to protect valuable corporate information on the Internet. LabOne can use MMS to set and implement policies for Internet communication, including email and browser-based communications, by applying content control, encryption, access control, attachment management, virus scanning and digital signatures. These policies can be administered centrally and enforced universally across LabOne's enterprise.

Because of the pending patient privacy standards mandated by federal rules implementing the Health Insurance Portability and Accountability Act of 1996 (HIPAA), healthcare organizations are seeking reliable security frameworks that will comply to these standards. "Confidentiality and security are very important to us," said Mark Adams, Vice President of Corporate Security for LabOne, Inc. "We chose MMS because we needed a solution that was scalable and easy to install. By integrating MMS with our existing email networks, we can centrally create policies to apply content filtering, and virus and spam protection, while remaining transparent to our end users. MMS provides LabOne the most comprehensive and secure Internet email management solution today."

"Every day, sensitive information is being exchanged via Internet email," said Jeffrey C. Smith, President and CEO, Tumbleweed Communications Corp. "Using Tumbleweed Messaging Management System, LabOne will be able to protect, manage and oversee their information assets traveling over the Internet. We are very pleased LabOne has chosen Tumbleweed MMS to safeguard their enterprise from harmful content."

About LabOne
LabOne is a national laboratory testing and information service provider with three divisions: insurance services, healthcare and substance abuse testing. The insurance services division, with its ExamOne and SBSI subsidiaries, provides proprietary information technologies CaseView and LabOne NET(T), and CaseOne case management service, to life and health insurance companies. These services include laboratory test results, paramedical examinations, attending physician statements, motor vehicle reports, background inspections and personal history interviews. LabOne's healthcare division provides medical diagnostic testing and related services to physicians and managed care organizations, and to benefit providers through its unique Lab CardŽ employee benefit program. The healthcare division's disease management reporting is specifically designed to provide managed care clients with HEDIS data necessary for their NCQA accreditation. The company's substance abuse testing division provides drug-testing services to Fortune 1000 employers and markets Intercept(T), the oral fluid drug test, in the workplace drug testing market. The company's web site is located at www.LabOne.com.

About Tumbleweed
Tumbleweed Communications (NASDAQ: TMWD) is a leading provider of mission critical messaging software that enables organizations to manage and secure online business communications and processes. Tumbleweed's customers use the company's solutions to define secure communication networks, to centrally control and monitor the corporate communications stream and to create a foundation for automated preparation and secure Internet delivery of sensitive business information. Companies that rely on Tumbleweed Communications solutions include American Express, Chase Manhattan Bank, Chevron, Datek Online, the European Union's Joint Research Council, FDA, 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. More information can be found at www.tumbleweed.com.

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.