Cloudmark

Critical Path and Cloudmark Partner to Deliver New Messaging Anti-Abuse Solution for Service Providers

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The new Memova™ Anti-Abuse C-2000 appliance — with integrated Cloudmark technology — provides strong protection against spam, phishing, viruses and other threats

SAN FRANCISCO — April 3, 2006 — Critical Path, Inc. (OTC: CPTH), a leading provider of messaging software and services, and Cloudmark® Inc., the proven leader in secure messaging from the desktop to the gateway, today announced a partnership to provide ISPs, wireless carriers and other service providers with advanced protection against messaging threats, such as spam and phishing, as well as a first line of defense against viruses. Through the partnership, Cloudmark Authority™ software is being integrated with Critical Path's Memova™ Anti-Abuse technology to bring a powerful new solution to market. The new Memova™ Anti-Abuse C-2000 is a turnkey appliance that significantly reduces abuse-related costs, detecting and stopping messaging threats with industry-low false-positive rates — regardless of the message's language or format.

Consumer risks are on the rise with the growing prevalence of spam and phishing attacks — fraudulent messages that contain requests for personal data that are often difficult to distinguish from legitimate email. In addition, according to industry experts, global spam and phishing attacks cost an estimated US $50 billion in increased resource requirements and higher customer service complaints in 2005, leaving service providers in search of superior and more cost-effective ways to protect their subscribers.

Building upon the success of Memova Anti-Abuse A-1000, Critical Path's introductory anti-abuse appliance launched in February 2005 and already deployed by more than 16 service providers, the new Memova Anti-Abuse C-2000 helps control escalating costs with a combination of Memova and Cloudmark technology. The appliance uses proprietary traffic management, throttling and tarpitting techniques, as well as SPF (Sender Policy Framework) and other mechanisms, to stop more than 75 percent of abusive traffic at the gateway. By integrating Cloudmark Authority, a carrier-grade gateway solution widely deployed in service provider networks around the world, the Memova Anti-Abuse C-2000 has real-time data feeds from the Cloudmark Collaborative Security Network, providing zero–hour/real-time protection against spam, phishing and virus threats. Additionally, the Cloudmark Network Classifier, unique fingerprinting algorithm technology, and a trust-based reporting system combine to deliver a predictive solution that offers increased accuracy and reduced false positives, regardless of email language or format.

"We're pleased to launch Memova Anti-Abuse C-2000," said Donald Dew, CTO, Critical Path. "The new appliance provides advanced contact-centric capabilities that enable consumers to dramatically reduce spam with contact 'safe lists' and other features, while choosing the level of protection that's most appropriate. It also provides support for double-byte languages and offers industry-leading performance and fault tolerance. In addition, the integration of Cloudmark technology — which consistently rates first in the industry for accuracy — enables us to bring the fastest and most accurate spam, virus and phishing detection to our customers."

"We're excited about the opportunity to work with Critical Path in Europe and Asia," said Vipul Ved Prakash, Founder and Chief Scientist, Cloudmark. "The complexity of spam and fraudulent attacks is on the rise and constantly morphing, and legacy solutions are not keeping pace with increasingly sophisticated challenges. As a result, ISPs, wireless carriers and other email service providers are facing enormous and growing costs in dealing with this problem. It is essential that service providers have strong anti-abuse protection at the gateway to minimize the need for costly content filtering and to keep mail stores from becoming overloaded with unfiltered spam. With the combination of Cloudmark Authority and Memova Anti-Abuse, service providers can meet their needs for comprehensive email protection with a powerful, flexible and easy-to-use solution."

The new Memova Anti-Abuse C-2000 appliance, with integrated Cloudmark Authority technology, is available now.

About Critical Path, Inc.

Critical Path's Memova™ solutions provide a new and improved email experience for millions of consumers worldwide, helping mobile operators, broadband and fixed-line service providers unlock the potential of email in the mass market. Memova™ Mobile gives consumers instant, on-the-go access to the messages that matter most. Featuring industry-leading anti-spam and anti-virus technology, Memova™ Anti-Abuse protects consumers against viruses and spam. Memova™ Messaging provides consumers with a rich email experience, enabling service providers to develop customized offerings for high-speed subscribers. Headquartered in San Francisco with offices around the globe, Critical Path's messaging solutions are deployed by more than 200 service providers throughout the world. More information is available at http://www.criticalpath.net.

Reporters, Editors — for additional information, contact:

Michelle Weber Critical Path, Inc.
415-541-2575
pr@criticalpath.net Carrie Baker High Road Communications
416-644-2264
cbaker@highroad.com

Forward-Looking Statements:

This press release contains forward-looking statements by the Company and its executives regarding the performance of our product and service offerings, the future release of our products and services and our customer's products and services which include our offerings, the ability of our customers to achieve cost savings and improve revenues in the provision of services, industry trends, market and customer requirements, the ability of our products and services to meet the business needs of our customers, the market for products and services like ours and the performance of our senior management in achieving strategic goals. The words and expressions "look forward to," "will," "expect," "plan," "believe," "seek," "strive for," "anticipate," "hope," "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, and 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/A for the fiscal year ended December 31, 2004, its Quarterly Reports on Forms 10-Q for the fiscal quarters ended March 31, June 30 and September 30 2005, Current Reports on Form 8-K, as may be amended from time to time, and all subsequent filings with the United States Securities and Exchange Commission (www.sec.gov). The Company makes no commitment to revise or update any forward-looking statements in order to reflect events or circumstances after the date any such statement is made.

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

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关于 Cloudmark

Cloudmark, Inc. 是运营商级消息传输基础架构与安全解决方案领域的行业领导者，为互联网服务提供商、移动网络运营商以及社交网络，提供业界最迅速、最精确且最具扩展性的邮件平台。Cloudmark 系列运营商级解决方案能够简化并强化对信息滥用行为的管理、提高网络利用率，并降低基础架构成本。Cloudmark 解决方案为全球最大运营商网络内的十几亿用户提供了保护。Cloudmark 是一家未上市企业，总部位于美国旧金山市，并在伦敦、巴黎、东京、新加坡和中国香港设立了分支机构。