zcs-NETWORK-5.0.11_GA_2696.RHEL4.20081117013729 on a
HP DL320 with 4 GB ram, CentOS 4 and 80+ user accounts
made sure not to be caught by the logger bug:
Logger Upgrade Bug Alert - Bug 34880
sit back and watch
Did get a fright when it seemed to stop with prov> appearing to look for input. But remembered seeing this in the forums, the install is just working in the background and not waiting for input.
Thanks to all at Zimbra for the easy upgrade