Zimbra is the leading open source solution for enterprise, service provider, education, and government environments; offering administrators and their end-users unmatched benefits. The powerful web client integrates email, contacts, shared calendar, VoIP, and online document authoring into a rich browser-based interface. Also, our unique open source Zimlet technology makes it easy for you to include custom 'mash-ups' in the ZCS web client.
ZCS also includes an elegant Ajax based admin interface plus full scripting tools to manage the ZCS server. Full support is provided for standards-based APIs (IMAP / POP / iCal / CalDAV) as well as MAPI and iSync, which enable seamless compatibility with other clients like Microsoft Outlook, Apple desktop suite, and Mozilla Thunderbird.
Zimbra also offers Zimbra Mobile, which provides over-the-air "push" synchronisation to smartphones such as iPhone, Android, Windows Mobile, Nokia and Sony Ericsson as well as a Connector for BlackBerry Enterprise Server.
The Zimbra solution also has a complete high security package including built-in anti-spam and anti-virus scanning.
Now Zimbra also features Archiving and Discovery, an optional component to save and search email for various compliance issues.
For additional information
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Zimbra Features summary
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Zimbra Email and Collaboration Benefits
Zimbra Network Edition Benefits
Zimbra Archiving and Discovery for Email Compliance
Zimbra Collaboration Suite Mobility
Microsoft Outlook, Thunderbird and Email Client Compatibility
Microsoft Outlook and the Zimbra Collaboration Suite
Migration Tools - for migration from Microsoft Exchange, Lotus Domino or Novell GroupWise to Zimbra
Hosted demo - Test Drive Zimbra instantly without having to install a Zimbra server