Zimbra Collaboration Suite 4.5.6 / 5.0.0 Beta 1

Zimbra Collaboration Suite project is a client/server technology for enterprise messaging and collaboration.
Zimbra delivers innovation for both the administrator and the end-user as well as compatibility with existing infrastructure and applications (both open source and proprietary).
The Zimbra Collaboration Suite provides support for email, contacts, and group calendaring, and consists of a server and client.
Main features:
Administrator Benefits
- Online move, backup and recovery of individual or a group of mailboxes
- Compatibility with Active Directory and existing LDAP directories
- Native hierarchical storage management and clustering
- Web services integration with existing enterprise applications
- Integrated anti-spam and anti-virus
End-User Benefits
- Browser based client with search, shared calendar and mail that is integrated with contacts and calendar
- Support for Outlook: calendar, mail, contacts and offline mode
- Support for mobile devices: Blackberry, Treo and etc
- Support of Windows, Apple and Linux computer.
Whats New in 5.0.0 Beta 1 Development Release:
- This is the first release in the 5.0.0 release cycle.
- New features include IM, Tasks, Standard Client autocompletion, and keyboard navigation.
- Updates have been made to migration wizards and apple/outlook connectors.
Whats New in 4.5.6 Stable Release:
- Support for an automated MySQL database corruption check that will send a notification to the admin.
- Spam training has been enhanced by allowing programmatic scanning of folders without requiring a password.
- Admins can get backup and restore complete notifications sent via email.
- .Doc and .pdf files open correctly in Zimbra Web Client.
- iSync will not duplicate the calendar, and iSync Connector works correctly with Mac OS X 10.4.10.
- Servers automatically start after a ZCS upgrade.
- Web-based cross-mailbox discovery is available for the optional Zimbra Archiving and Discovery module.