I have been doing some reading and I am under the impression that I cannot simply update from v4.0 to V5.0. I have to update to V4.5 first.
Aside from a bunch of backups, what should I be aware of going from 4.0 to 4.5? Will I lose my user accounts? Do I need to backup and restore all users e-mail or will it leave it alone. Also, should I just jump from 4.0 to 4.5.11 or should I start at 4.5.8 or something and update from there?
Links to any wiki pages to read would be great!
CENTOS 4 / RHEL 4
Zimbra Open Source edition 4.0