Please don't forget a
zmbackup, disk image, or even a rsync:
su - zimbra
zmcontrol stop
exit
su root (if not already at this point)
ps aux | grep zimbra (kill -9 pid# of any remaining processes)
mkdir /zcsbackup
rsync -avHK /opt/zimbra/ /zcsbackup/zimbra
mkdir /zcsbackuptars
tar -zcvf /zcsbackuptars/backup.zimbra.5RC1.20071231.tar.gz -C /zcsbackup/zimbra .
mv or scp /zcsbackuptars/backup.zimbra.5RC1.20071231.tar.gz /elsewhereAsDesired
Have the old 4.5.4 installer handy in advance just in case you need to restore so you don't have to wait for it to download
