Kudos to the Zimbra team again.
I have had a hacked 4.0.2 (upgraded from an early 3.something) running on my Ubuntu VServer for over a year now and thought I'd take the plunge and upgrade to 4.5 RC2.
It was a hiccup free upgrade and the only thing I had to modify were a few setting to make things work in a vserver. Even logging and graphing worked without the fix in the first post!
