Tried to sign into MSN messenger and got the "password or username is incorrect" message. The password was not changed at all, and i signed into msn using the password that was already stored earlier. I retyped password (checked caps lock) and no joy. Error code was 80048823. Preliminary googling couldn't find any results of other people beating this problem.
Tried to sign into passport.com, and got this message:
Lockout - "You've tried to sign in too many times with an incorrect e-mail address or password, or someone else is trying to sign in to the account email@example.com"
So I reset the password and tried to sign in again with the new password, but got the same message.
I was able to sign into passport and MSN with my 3 other passport accounts minutes before, and still can now. The only thing 'different' about this email address that i can think of is that it is of a yahoo.com domain, but it is passport.com registered so it shouldn't matter?