This command will export accounts belonging to the specified area from the accounts-push-data.tgz file under the /opt/zimbra/tmp/modules/drive folder. If you will get any problems, you are able to re-export, and re-import the problematic accounts by manipulating /migration/zimbra/accounts/consumers.txt appropriately and re-jogging the export command. If you obtain any “broken pipe” kind https://www.hostscheap.com/zimbra-migration-service