Unity 4.0(5). We are going to move are Unity servers to a new Exchange 2003 message store. We run in failover mode. Is the only thing that I need to do is run the message store config wizard on both servers and point them to the new message store? We have 4000 users on the system. Does anyone know an estimated time of how long this will possibly take and will this process bring over the messages from the other message store.