Everyone has been on the edge of their seats with anticipation, so without further ado: The Zimbra Collaboration Suite version 6.0 is now generally available!
With several thousand changes, there are far to many to list in this announcement; so here are a few places that provide overviews on the staggering number of cutting-edge enhancements:
»
Beta 1 Blog
»
Beta 2 Announcement
»
RC 1 & GA Feature List PDF
»
Product Tracking Portal
Before upgrading,
kick-off a backup while you read the information-packed release notes.
6.0.0 Network Edition: Release Notes &
Downloads 
6.0.0 Open Source Edition: Release Notes &
Downloads
From all of us here at Zimbra, we would like to extend our deepest thanks to the numerous organizations, developers, and testers who vetted the betas. Your feedback is invaluable. To those early adopters who will rush to deploy it on their systems: Your vote of confidence is the best encouragement our community can get. Thanks to all for helping to shape the next evolution of modern messaging software.
Subscribe to the
blog for news on the latest innovations, and enjoy this GA release!
-The Zimbra Team
~~~
To answer a some common questions in advance:
-Posix & Samba extension users should understand
doc1 &
doc2
-Disclaimer extension also has some
specifics.
-Large setups may be interested in
optimizing the LDAP upgrade step, and for 1M+ sites
bug 40648
-Some additional platforms are available; where prudent go 64-bit, it'll be supported longer.
-ZCS 5.0 releases will cover major issues only, 4.5 is now
EOL.
-DL alias
bug 40759
Bugzilla
Wiki
Source
ZCS 6.0 Goes GA! 
Linear Mode
