Zimbra Expands Support for Award-Winning Collaboration Suite

Suite Now Offers Safari 3 Integration, CalDAV Support for iCal on
Mac OS X Leopard, and Optimized iPhone Support
SAN MATEO, Calif.--(Business Wire)--Zimbra, a Yahoo! (Nasdaq:YHOO) company, and the leader in open
source, next-generation messaging and collaboration software, today
announced that it has expanded its support for Apple products and
technologies, including Safari 3 and CalDAV for Mac OS X Leopard.

"The amazing speed of Safari 3 has blown the Zimbra team away and
we are excited to be the first major collaboration platform to support
the calendaring standard CalDAV," said Satish Dharmaraj, CEO and
co-founder of Zimbra. "We also wanted to expand our support for the
iPhone by adding an optimized mobile web experience on top of our
iSync support."

"Leopard is packed with more than 300 new features, including
major enhancements to Safari and iCal," said Ron Okamoto, Apple's vice
president of Worldwide Developer Relations. "We're pleased that Zimbra
users can take advantage of the world's fastest browser with Safari
and improved iCal group calendaring with CalDAV in Leopard."

The Zimbra Collaboration Suite (ZCS) fully supports Safari 3,
which is the fastest Web browser on any platform and is available for
Tiger and Leopard users and is in beta on Windows. ZCS's rich AJAX
interface, including email, calendaring, Zimbra Documents, and
customizable mash-ups called Zimlets, takes full advantage of Safari's
optimized AJAX browsing experience.

To meet the advanced calendaring needs of Mac users, Zimbra now
supports CalDAV, a key feature for customers using Leopard's iCal 3 as
their calendaring client. Based on a public standard, CalDAV allows
users to synchronize and browse free/busy time and recurring
appointments easily, both with personal and public calendars.

Additionally, ZCS is now available to iPhone users via the Zimbra
Mobile HTML client. The iPhone's Safari browser enables fast access to
the full-featured AJAX interface, and the Zimbra Connector for Apple
iSync allows users to sync not only their email but also their address
books and calendars to their iPhones.

These enhancements reflect Zimbra's ongoing commitment to the Mac
community, and to providing innovative features for the Mac platform.
Zimbra has long supported iSync, which provides a two-way sync between
Apple Mail, Address Book, iCal, Microsoft Entourage, and the ZCS
server. To test these new capabilities including support for Safari,
CalDAV and iPhone, visit www.zimbra.com and register for a Hosted Demo
Account.

Pricing and Availability

The ZCS 5.0 Open Source Edition, available now, is free. The
commercially supported ZCS 5.0 Network Edition is available for a
60-day free trial on the Zimbra Website. ZCS Network Edition is
available at a significant educational discount by contacting
sales@zimbra.com. The Network Edition includes product support as well
as software subscriptions to new releases, updates and patches. ZCS is
available on-premise or as a hosted service; for information about
Zimbra On-Demand or Zimbra's hosting partner program, please visit
http://www.zimbra.com/partners/. Users can discuss topics related to
the Zimbra Collaboration Suite and provide feedback at
http://www.zimbra.com/forums/.

About Zimbra

Zimbra, a Yahoo! company, is a leading provider of collaboration
software for universities, businesses and service providers. Zimbra's
rich AJAX interface is available on or offline to dramatically improve
the collaboration experience. Zimbra is available on-premise or
on-demand through our extensive hosted partner program. More
information at http://www.zimbra.com/.

About Yahoo!

Yahoo! Inc. is a leading global Internet brand and one of the most
trafficked Internet destinations worldwide. Yahoo! is focused on
powering its communities of users, advertisers, publishers, and
developers by creating indispensable experiences built on trust.
Yahoo! is headquartered in Sunnyvale, California. For more
information, visit pressroom.yahoo.com or the company's blog, Yodel
Anecdotal.

OutCast Communications
Liz Clinkenbeard, 415-392-8282 (Media)
liz@outcastpr.com

Copyright Business Wire 2008