I was connected to msn today and I suddenly saw this.
http://imageshack.us/photo/my-images/88/screenshot7hn.png/
My first guess was someone cracked my password. I went to live.com and changed my password into something that is the combination of capital letters, small letters and numbers (for example LeBGeeKS907856).
Then I closed the firefox window but I am still getting that same message.
(Yes I know MS is ebul, etc.. etc.. and I shouldn't be using their services but a lot of my friends do so I registered my gmail address as a .net passport years ago)
Edit:. I can log into my account now but it's very weird. I still don't know why I was getting messages that I was logged into from another location. I only have one computer at home and I never sign in from other places..