Windows Logins abide by the login policies of the underlying Operating System. In SQL Server 2005 and later, SQL Server logins can also adhere to the windows login policies if the operating system version is Windows Server 2003 and later.

Check this

http://support.microsoft.com/kb/2028712

http://technet.microsoft.com/en-us/library/cc875814.aspx -- Check pt 12

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SQLBuddy