I have moved your question to a separate thread as it is not related to Message Carbons. Route all resources options are not intended to make it work as Message Carbons. This is only a workaround for some specific scenarios. If you really need proper message synchronization, then Message Carbons is the only way. But it only syncs messages when all clients are online, it won’t do it if a client is offline. More information Explanation: message synchronization between clients