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Upgraded our Zimbra server last night without any problems in under 1 hour from ./install.sh to all tested working
upgrade fixed mulitple issues and so far so good,
One user did have an email that he received some months ago appear at the top of his inbox dated as if it had just arrived and unread. Still not sure what happened with that.
Bugzilla
Wiki
Source
success upgrading 5.0.2 > 5.0.5 
Linear Mode
