Hi,
After my search, I think this is by design.
In Windows XP, Windows Server 2003 or previous version OS. When your password is 14 days from expiration, you will receive a Password Change Notification when logging on computer.
But form Windows 7 and Windows Server 2008 R2, when you password is 5 days from expiration, you will receive notification Consider changing your password.
I think you may contact MSDN supporter about how to customize a prompt message.
MSDN Windows Server Forum
http://social.msdn.microsoft.com/Forums/en-US/category/windowsserverFor more information please refer to following MS articles:
How to change the password expiry notice default
http://technet.microsoft.com/en-us/library/ee829687(v=WS.10).aspxWindows Prompts You to Change Your Password Although No Password Was Configured
http://support.microsoft.com/kb/810877Notifying users by e-mail their password is going to expire
http://blogs.dirteam.com/blogs/jorge/archive/2008/07/20/notifying-users-by-e-mail-their-password-is-going-to-expire.aspxHope this helps!
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