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I've just upgraded from 4.0.4 Open Source to 4.0.5 Network, and it went OK, but one thing I seem to be missing is the backup option on the GUI... is the GUI backup only available for 4.5? I know you can do CLI backup and restore, but I'd like to know if I should be something on the GUI that i'm not :-)
I'm not criticising or in any way running down Zimbra, I think it's great! But I've just seen a lot of '4.5 Upgrade Failed' type of topics in the forum...
I've had no problems upgrading so far, but I always wait until either .2 or .3 of a release anyway. :-)