Meets Needs of Large Organizations to Enable Heterogeneous Computing Environments

Yahoo! Inc.

Terrell Karlsten, 408-349-5528

terrellk@yahoo-inc.com

or

OutCast Communications

Sara Cohen, 415-392-8282

sara@outcastpr.com

Logo: http://www.yahoo.com

Zimbra, a Yahoo! (Nasdaq:YHOO) company and the leader in open source, next-generation messaging and collaboration software, today announced the availability of a new open extension framework for Zimbra Collaboration Suite(TM) (ZCS) that enables two-way interoperability with leading collaboration platforms. Large enterprises and academic institutions can now easily integrate teams using Zimbra to work seamlessly with other departments that use different collaboration servers like Microsoft Exchange, exploring the benefits of Zimbra without having to make the decision to replace their current systems up front. This extends Zimbra's history of openness and compatibility to a broader range of platforms, and builds on Yahoo!'s leadership in e-mail as a key starting point for users.

The first extension, built by Zimbra for the Microsoft Exchange 2003 platform, and now in beta, allows Zimbra users to access and share two-way free/busy information, schedules and global address book with colleagues whose data resides on Microsoft Exchange. The framework is also openly available for anyone in the Zimbra community to write an extension to other collaboration platforms such as IBM Lotus Domino, Novell(R) GroupWise(R), or PeopleCube Meeting Maker.

"Interoperability with Exchange and other leading collaboration systems is a top request by many enterprises and academic institutions where mixed deployments are common," said Satish Dharmaraj, Zimbra co-founder and Yahoo! vice president. "Zimbra's recent growth with large organizations has been tremendous, with recent customer wins and deal expansions including Dai Nippon Publishing, Reliance Industries, H&R Block and Texas A&M University. This interoperability builds upon a long record of compatibility work by Zimbra and is one of the key needs for our largest customers."

ZCS Interoperability for Exchange features:

-- Free/busy and schedule interoperability: ZCS now has the ability to view free/busy calendar information in Exchange, allowing a Zimbra user to schedule a meeting with Exchange users as well as book resources like meeting rooms. Conversely Exchange users can also schedule ZCS users; in this regard, it is no different than working with another Exchange user.