Zimbra announced that it has more than four million paid Zimbra mailboxes globally through onsite deployments and its hosted partner program. More than 1,000 enterprises and organizations have deployed Zimbra across all industry segments, including financial services, healthcare, government and education. Additionally, millions of more users have implemented the Zimbra open source edition and there are more than 4,500 developers and administrators actively participating in the Zimbra Community.

"The momentous worldwide growth we have experienced since launching a year ago is a clear indication that the market is ready for a collaboration alternative with a strong foundation in innovation and open source," said Satish Dharmaraj, Zimbra CEO and co-founder. "We built the ZCS to meet the needs of both on-premise and on-demand deployments, and we continue to see tremendous uptake across the board, from on-premise customers and from partners that leverage Zimbra as a hosted service."

New customers and partners such as Digg.com and Singlefin join established customers and partners such as tax services provider H&R Block, real estate brokerage firm ZipRealty, IT consulting firm Exigent Technologies, Internet service provider Homestead and hosting service provider Amicus.

"Zimbra's flexibility makes it a great partner. It enables service providers to deploy different tiers of services at different prices, depending on their customers' needs," said Jake Jacoby, president, Singlefin. "We have achieved a remarkably lower TCO using Zimbra, because all of our users can leverage a single infrastructure and we have seen dramatic improvements in our ability to sell premium services."

Zimbra has added new strategic partnerships and expanded its relationship with technology leaders such as Mozilla, RedHat and Jive Software. Additionally, many open source companies and projects serve key roles in the ZCS and greater Zimbra ecosystem, including Apache, ClamAV, Debian Linux, MySQL, OpenLDAP, Postfix, Sleepycat, SpamAssassin, SUSE Linux and Ubuntu. In early 2006, Zimbra co-founded and launched the OpenAJAX alliance with industry leaders BEA, Google, IBM, Oracle, Red Hat, Yahoo! and Zend.

The Zimbra Collaboration Suite (ZCS) provides a unique set of end-user and administrator benefits that make it a flexible solution for deployments of all sizes, from SMBs, to multi-thousand seat enterprises, to service providers with one million plus customers. Key features include next-generation email; shared calendaring; Web document authoring and sharing; "over the air" synchronization to a wide range of mobile devices; VoIP integration; and compatibility with Microsoft Outlook, Apple and Linux desktops. The ZCS server is available for popular operating systems: RedHat Enterprise Linux, Ubuntu, Fedora, Mac OS X, Debian and SUSE Linux.