Hello guys,
I have been running zimbra 3.1.3 (open source) with Fedora Core 3 for a while now. I would like to upgrade to the new 4.5.5 but I'm not so sure what exact path to follow. I am thinking first of all I might need to upgrade my operating system to either Fedora 4/5 or any of the present listed supported operating systems and also i ve been reading in the forums and everyone keeps advising not to go upgrade straight from 3.1 to 4.5, so i would appreciate any help or directions in running a smooth upgrade or maybe some tool that enables that.

Regards.