I would really appreciate if you could lower the installation barrier even further. I know most of you may think it is already low and if I can't cope with that I shouldn't even bother with an own server installation. However, I do think that you could make it even easier, like installing and configuring Apache ("apt-get" anyone?).
The biggest hurdle for me is the whole DNS/BIND stuff and the feeling I never will be able to administer the monster ;-)
PS: Is there a way to install zimbra as a (local) test installation in virtualbox without messing around with the DNS stuff?