I am migrating from an older server running Zimbra 4.5.3 (32 bit) to a new server running 5.0.18 (64 bit Centos 5.3) I've created a newly named server with a new IP number and I have installed the latest Zimbra and authenticated it into a Windows 2003 DC.

On the old server I have been backing up daily to an NFS share mounted on /opt/zimbra/backup. To move my users e-mail data over to the new server can I simply remount that NFS share on the new server and restore mailboxes (one at a time or all at once)?

Will this work or is there a better way? I need to do this with minimum down time.