RE: More than one user at the same time??
Only one person can be signed in on the same Windows Live account at the same time. Thus, when someone else signs into your account while you are online, you'll get signed out and see a toast message saying "You have signed in to Messenger on another computer. Click here to sign in again."
Occasional disconnects can happen, either due to your internet connection or Messenger's servers.
But when you suspect that someone else is signing in to your account, you should change your password just to be on the safe side.
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