My Exchange Server 2003 (running on Windows Server 2003) fails at around 04:54 on a regular basis, though not necessarily every day.
By "fails" I mean that my colleagues try and check their emails and Outlook says "outlook is not connected to exchange." Since outlook tries to update the email every 3 minutes or so, and it records the time when the folder was last updated, it is possible to see the time of failure.
It is impossible to download emails until the server is restarted. Thereupon everything works well.
I have looked in Scheduled Tasks and can't see anything pertinent.
Does anyone have any ideas?