One of my fiends asked me that:
When I try to login to my Yahoo I show this message several days ago?
Your account has been locked . ( 81003003) This is what yahoo had to say.
We released an updated version of Yahoo! Messenger 9.0 today (9.0.0.2128). This latest build includes a fix for the sign-in issues that have been affecting some users. If you were seeing an error code “81003005” when trying to sign in, this latest version may fix that problem. Even if you were experiencing a different kind of sign-in issue, we recommend installing this latest version.
http://messenger.yahoo.com/download/win
http://www.ymessengerblog.com/blog/