On my company's computer at work, I found another person's username on my login dialog for Exchange. I examined the security logs and found no traces of remote or local access. No one uses this computer but me.
The username belongs to one of the administrators, and he used remote login long time ago. He also has a user directory. However, I wonder why his username appears now? Is it possible that he logged in and covered his tracks (but not all)?
Is there any other place where i can find if he was logged in recently except logs?