Thanks, so far I've only had to do this once and it was due to failed hardware a couple years ago. Restoring from backups worked, but lost the server settings. I'll probably do a p2v conversion for a full server backup before hand, but this will help the upgrade to RHEL6.
Mail | Dell 2950III | 2x Quad Core 5420 | 8gb RAM | 6x 146gb SAS RAID 0+1 | Red Hat 5.3 | Zimbra 6.0.10 Network Edition
Test | VMware ESXi Whitebox | Phenom II Black 3.2ghz | 12gb RAM | 6x 1tb SATA RAID 0+1 | CentOS 5.4 | FOSS, Not in use now