I periodically sign onto two older hotmail accounts I have as they have saved emails that are important.  I last signed into both of them on 9/1/13.  Today (10/26/13) I tried to sign into both of them and was successful with one, but the other gives me an error message that says "this account doesn't exist".  I am religious about signing in as I realize if you don't that a dormant account may be deleted.

Can someone help me find out why this is happening to only this one account?

Thank you!!