I have a buddy that works in a big office, and he was woundering how safe IM's are? [No it's not me, I use my own PC at work ] His coumpany can track down what web sites he goes to, and check emails, and he just wants to know how IM's work. Everything I can find for him shows that once you close that window, it's gone. Anyone know? I know you CAN save them, but do they get kept on a company main frame?