My brother-in-law, the IT geek, explained to to a new hire that all of his e-mails & internet surfing could be tracked.
The guy was surprised to hear that.
Again, where I used to work, my buddy in IT said they track everything but the only time it is actually looked @ by an employee is if there is a request from the person's boss or the automatic system trips an alarm. The only time that happened was when someone was running a file sharing program and using huge amounts of bandwidth.
As he put it to me, if we want to fire someone, all we have to do is look @ their computer records. Some where along the line everyone has violated a rule or two.