Critical Path Powers More Than 100 Million Mailboxes and Wireless Devices Worldwide.

Business Editors, High-Tech Writers

SAN FRANCISCO--(BUSINESS WIRE)--April 19, 2000

Through Allsourcing Strategy, Critical Path Effectively Meets Growing

Messaging Needs of Diverse Customer Base

Critical Path, Inc. (Nasdaq: CPTH), the dominant global provider of business-to-business Internet messaging and collaboration solutions, today announced its technology now powers more than 100 million mailboxes and wireless devices worldwide. This includes Critical Path's outsourced mailboxes in its mail centers, insourced mailboxes at customer premises and the company's wireless users.

"This is an incredible milestone for Critical Path," said Doug Hickey, Critical Path's CEO. "Our ability to reach this number of mailboxes in such a short period of time demonstrates our commitment to provide customers with the most robust, flexible and scalable messaging solutions available and validates our strategy to provide complete end-to-end messaging services. Whether a company wants to outsource all or part of their messaging system, or build it internally, Critical Path is the only company that can offer customers the solution of their choice."

Through an "Allsourcing" strategy, Critical Path can meet the growing messaging demands of a diverse customer base by offer businesses the ability to outsource, midsource or insource all or part of their messaging applications. Critical Path's outsourcing enables customers to have their messaging applications hosted by Critical Path at one of its mail center locations throughout the U.S., Europe, and soon in Asia. Midsourcing offers customers the option to selectively decide which Critical Path value added messaging applications to outsource and which to keep in house. As messaging infrastructures grow more complex, features such as fax-over-IP, calendaring, guaranteed delivery, directory services, wireless messaging, secure online document management and threaded discussions for knowledge exchange have become more widely adopted making messaging one of the leading outsourced applications. Critical Path also provides a software solution enabling customers to run their messaging applications in-house, while benefiting from Critical Path's advanced Internet messaging technology.

Critical Path will provide more detail on its business and release earnings results for the first quarter ended March 31, 2000, at the close of market on April 20, 2000.

About Critical Path, Inc.

Critical Path, Inc. (Nasdaq: CPTH) is the dominant global provider of complete end-to-end Internet messaging and collaboration solutions for wireless, Internet-centric, telecommunication and corporate businesses. Through its allsourcing strategy, Critical Path is the only advanced messaging provider to offer businesses the flexibility to outsource, midsource or insource all or part of their messaging and collaboration applications. Critical Path has built an industry-leading global infrastructure with data centers connected to key Internet exchange points. Critical Path provides reliable, secure, and scalable email and a flexible suite of enhanced messaging services to partners such as E*TRADE, CompuServe, Network Solutions, US West, Sprint, France Telecom, British Telecommunications, and ICQ. Critical Path is headquartered in San Francisco, with offices in locations nationwide and in Germany, England, Ireland, France, Denmark, Italy, Switzerland, Brazil and Argentina. More information on Critical Path can be found at www.cp.net.

Critical Path is a service mark and the Critical Path logo is a trademark of Critical Path, Inc.

The statements in this press release relating to matters that are not historical are forward-looking statements. Actual results could differ materially from these forward-looking statements. Risks and uncertainties facing 6Critical Path are described in the company's 10K and with its periodic filings with the Securities and Exchange Commission (www.sec.gov).

Note to Editors: there in the fifth paragraph in the word "E-TRADE" between the E and the T. This symbol may not translate in all systems.