Critical Path's Messaging Server Protects Hundreds of Thousands of Terra Lycos Mexico Users From Recent Virus Outbreaks.

Business Editors/High-Tech Writers

SAN FRANCISCO--(BUSINESS WIRE)--Sept. 5, 2001

Critical Path Provides One of Mexico's Top ISPs

With Performance, Scalability and Security

Critical Path, Inc. (Nasdaq:CPTH), a global leader in communication technology and complete messaging solutions for wireless and wireline carriers, service providers and corporations, today announced that its Messaging Server successfully protected Terra Lycos Mexico, one of the largest Internet service providers in Mexico, from several recent virus outbreaks. Critical Path's Messaging Server along with Terra Lycos Mexico's infrastructure, allowed the company to remain functional and continue offering Internet access and email services during recent virus attacks including SIRCAM, through built-in anti-virus and anti-Spam capabilities. Terra Lycos Mexico, a subsidiary of Terra Lycos (MC:TRR)(Nasdaq:TRLY), the largest global Internet network, is currently running more than 900,000 users on their Critical Path messaging system.

"One of our greatest competitive advantages, we believe highlighted by our successful support of Terra Lycos Mexico, is our ability to secure our customers' messaging systems and offer them virtually zero unscheduled downtime," said Sue Barsamian, Senior Vice President of Marketing for Critical Path. "It is this level of performance, reliability and security that promotes the adoption of our Messaging Server among global service providers and corporations."

Protection of Terra Lycos Mexico's users demonstrates Critical Path's continued commitment to supporting global service providers and corporations seeking scalable and secure email solutions. As one of the most cost-effective solutions, Critical Path's Messaging Server serves as an ideal base from which to grow a messaging platform for global service providers such as Terra Lycos Mexico. Traditional groupware messaging and piece-meal messaging systems may be incapable of delivering a messaging infrastructure that can support explosive growth and deliver new value-added services to users. Illustrating this challenge, it appears that other leading ISPs in Mexico, not running on Critical Path's Messaging Server, apparently experienced outages attributed to the virus, some lasting up to five days. Terra Lycos Mexico recently completed a successful pilot of Critical Path's Messaging Server 6.0 and will soon be able to leverage new features such as more extensive anti-virus and anti-Spam capabilities and improved performance and manageability.

"Our growing number of subscribers presented us with a manageability and scalability challenge that could not be easily addressed by our previous messaging platform," said Arturo Galvan, President of Terra Lycos Mexico. "We selected Critical Path's Messaging Server because it provides the scalability to meet the demands of our booming messaging market. As an integral part of Critical Path's communications platform, the solution also lays the foundation for us to further develop value-added services and allows us to bring flexible, reliable and secure messaging services to our customers. Critical Path's flawless level of protection during the recent virus attacks reinforces our belief that Critical Path provides the most comprehensive messaging platform on the market."

As of March 31, 2001, Critical Path's Messaging Server supported more than 142 million mailboxes worldwide and acts as the anchor for Critical Path's integrated communications platform upon which additional value-added services such as secure messaging, calendaring, Internet file storage, and a personal address book can be built and deployed to help customers generate new revenues. The Critical Path communication platform delivers a core set of messaging applications along with a unified interface and back-end system management through the Critical Path Directory and Meta-directory solutions.

About Terra Lycos

Terra Lycos is a global Internet network operating in 43 countries in 20 languages, reaching 103 million unique monthly visitors worldwide. Created by the combination of Terra Networks, S.A. and Lycos, Inc., in October 2000, Terra Lycos is one of the most popular Internet networks in the U.S., Canada, Europe, Asia and Latin America, and is the third largest Internet access provider in the world. The Terra Lycos network of sites includes Lycos.com, Terra.com, Angelfire.com, ATuHora.com, Gamesville.com, HotBot.com, Invertia.com, Lycos Zone, Matchmaker.com, Quote.com, Rumbo.com, Sonique, Tripod.com, RagingBull.com and Wired News (Wired.com). The company's headquarters are in Barcelona and it has major offices in Boston, Buenos Aires, Madrid, Miami, Monterrey and Sao Paulo among others. It is listed on the Madrid stock exchange (TRR) and on the Nasdaq electronic market (TRLY). For more information, please visit our corporate Web site at http://www.terralycos.com.

About Critical Path, Inc.

Critical Path, Inc. (Nasdaq:CPTH) is a global leader in communication technology and complete messaging solutions for wireless and wireline carriers, service providers and corporations through its integrated platform of messaging applications and directory infrastructure. Critical Path is headquartered in San Francisco, with offices throughout North America, Europe, Asia and Latin America. More information on Critical Path can be found at http://www.cp.net./.

Forward Looking Statements

This press release contains forward-looking statements by the Company and others regarding expected future business, financial and product performance, including its customer's testimonials and the Company's statements regarding endorsements of our product and services offerings by our customers, our belief as to the ability of our products to ensure performance, virus protection, security, scalability, cost-effectiveness and reliability and the market for outsourced services like ours. The words "will," "expect," "plan," "believe," "seek," "anticipate," "estimate" and similar expressions are intended to identify the Company's forward-looking statements. These forward-looking statements involve a number of risks and uncertainties that could cause actual results to differ materially from those anticipated. These risks include, but are not limited to, our evolving business strategy and the emerging and changing nature of the market for our products and services, our ability to deliver on our sales objectives, the ability of our technology and our competitors' technologies to address customer demands, changes in economic and market conditions, unplanned virus attacks, system interruptions and capacity constraints, software and service design defects. These and other risks and uncertainties are described in more detail in the Company's filings with the U.S Securities and Exchange Commission (www.sec.gov) made from time to time, including Critical Path's Annual Report on Form 10-K for the fiscal year ended December 31, 2000, as amended, and the Quarterly Reports on Form 10-Q for the quarters ended June 30, 2001 and March 30, 2001, both as may be amended from time to time.

Note to Editors: Critical Path and the Critical Path logo are the trademarks of Critical Path, Inc. All other trademarks are the property of their holders.