I currently have Release 4.5.9_GA_1454.FC5_20071016190605 FC5 FOSS edition and I am looking to upgrade my box to a RHEL5 box with Zimbra version 5 on it. I was reading the documentation online about backing up and restoring, but the zmbackup command doesn't seem to be present on my 4.5.9 version. Can anyone give me some ideas on what the best way to migrate my data off the old box and onto the new box would be? Is it possible to just upgrade the old box to version 5? Any help would be greatly appreciated. Thanks!