I use Zimbra for my mail server and I am happy to see Zimbra now supports CalDAV. This means   you now can sync your calendar for Mac OS X  using Mail.app and iCal without and third-party add-ons. 

To setup a CalDAV account in Mail.app:

1. Go to Preferences > Accounts and click the "Plus" button to add a new account.
2. Set any description, and enter your Zimbra username and password
3. Click the disclosure triangle and enter the server address

4. Click Add and your calendars will immediately start synchronizing.

For those of you not familiar with Zimbra Collaboration Suite(ZCS), Version 5.0 launched earlier this month. The open source edition of ZCS is available here. 

[Thanks to my co-worker Rick Kilcoyne for sharing the tip.] 

Technorati Tags: CalDAV, collaboration, Mail, messaging, Open Source, Zimbra

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