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" (Although you are getting code 81003003) 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/
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