What's New in Zimbra Collaboration Suite 4.5
Many significant new features have been added to ZCS 4.5 based on feedback from the Zimbra Community. We focused on three main areas:
* Communications hub for End-users
* More control for Administrators
* Exposing ZCS to a wider audience
Centralized communications in the ZCS Web Client
* Aggregate external POP email accounts
* Use Mail Identities to automatically choose different signatures or 'from' addresses
* Create personalized distribution lists from your own contacts
Easier and more flexible administration
* Ability to specify higher security requirements on end-user passwords
* Domain administrators can now set mailbox quotas
* Service providers can set mailbox account limits per domain
* Manage account backup and restore as well as Zimlet deployment from the Administration Console
ZCS for a wider audience
* Read email in basic HTML mode
* New operating systems: Ubuntu, VMware, rPath, and Mandriva
Other features
* Zimbra Mobile now supports "push" email to devices
* Support for Tasks in Microsoft Outlook
* Delegate email and calendar access in Microsoft Outlook
* Mail archiving and search (beta)