[zimbra@zimbra zmigrate]$ for i in `cat /backups/zmigrate/domains.txt `; do zmprov cd $i zimbraAuthMech zimbra ;echo $i ;finished As you'll be able to see from this process, it really is platform-unbiased. Also, it does not transfer Previous server settings to the new server. You must set all settings as per former https://www.hostscheap.com/zimbra-migration-service