Once the client sites are set up and the email working the next big issue is the "missing mails" that were sent during the various stages of downtime.
In theory we should be able to get all of these, but I wont sugar the pill, the myraid mail systems that have been set up as temp measures and the general server problems means that some mails might have gone missing. We don't expect many, we hope none, but we just cant tell yet.