We have a 2003 exchange server that over the last month has had 3 strange events. The server just stops receiving or sending messages. There are no errors logged in the event viewer to indicate a problem with any of the exchange features or the server itself. Twice the inetinfo.exe process had to be stopped and restarted for messages to sent or received. Followed by the server having to be completely restarted. The third time the information store had to be restarted for email flow to be restored. I have never seen this before and need some advice.