had a similar issue a while ago and turned out to be the View settings , it had hidden an entire weeks worth of emails took me ages to spot it. Check this is not whats happened in this case.
Oliver here very out of date as well but works fine never really had to do anything with it , check the backup runs role the pupils forward which is easy thats it
Expensive, poor communication with client and the machines are not that great. Used in the past but never again. maybe since the takeover they might have improved