I have a MS exchanger server. In its Application Event Log, there is a sequence of strange events, Event Log ID 1013, 1016 and 10129. Basically, it tells me “user1” logons “user2” email account but failed without appropriate authority. Although I have done some background survey, I can't figure out what user1 did. User1 is a normal user without Administrator right and he is not a technical person.
Furthermore, it is not a single case. I find a similar event on other user.
I wonder there is some false setting on Exchange which causes the warning. If so, I need to find it out and rectify it.
The technical background is : Client - Windows XP with Office 2003. Server - Exchange 2003.