Windows Vista and Windows Server 2008 include additional group policy settings that give the administrator more granular management of their user's workstations. To leverage these new configuration items, the schema of a Server 2003 Active Directory
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Read the complete post at http://blogs.technet.com/rwagg/archive/2010/03/11/extend-your-server-2003-active-directory-schema-for-windows-vista-and-server-2008.aspx