We have an Exchange 2007 server that works brilliantly for a few hours, but then after 4 or 5 hours seems to stop receiving mail from external sources. I've tried stoppping and starting all the exchange services to remedy this but it does not seem to work. Messages are still received internally. The only cure that I can find is to to a full re boot of the server. If it helps, when this error occurs, users at home can no longer access the OWA element (web outlook).
If anybody can provide any solutions/help/advice or could just point me in the right direction I would be very grateful.