If there are no Gadget Management(ABQ) policies applied OR cell sharing is disabled for ActiveSync people, it is possible to skip the ways to export/import the cellular data. You'll need to disable the zimbraMailboxMoveSkipBlobs and zimbraMailboxMoveSkipHsmBlobs attributes over the resource(NG) server just before initiating the account migration. File /choose/zimbra/tmp/modules/backup... https://www.hostscheap.com/zimbra-migration-service