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FYI: Upgrade success to Zimbra 4.5 OpenSource on Ubuntu
After all the negative posts about failed upgrades please let me report that my upgrade of our small companies mail-server to Zimbra 4.5 succeeded without a hitch.
I especially love the responsiveness of the new plain-HTML client (I just exchanged some mail with a friend and it seemed more like chatting) and now I can finally remove the SquirrelMail Client we used for accessing the Zimbra accounts when we are at customers sites where no Firefox was available and the Internet Explorer had ActiveX Components turned off.
Thanks for this great release and in general this great piece of software.