I've been using my @mac.com passport with MSN Messenger for months and months. Never had any problems. Until today. I tried to sign in - got a box saying I need to change my sign-in ID. Link. Well, my sign-in ID is the @mac.com email, so if I change that then that means I have a NEW email. I can log into all my old MSN Accounts no problem (@hotmail.com though). Why do I have to change my sign-in ID? This really has annoyed me, because I can't even freaking log in to save my contact list, so when I change my sign-in ID I'll end up loosing them all. *****ing Microsoft is ALWAYS doing this.