Extend Schema Requirements:\nDomain account member of schema admins and enterprise admins\nMachine in which you extend schema must be:\n1.  On the same domain and active directory site as the schema master server\n2.  One of the following:\n     a.  Windows Server 2003 SP2 with Windows Installer 4.5 installed\n     b.  Windows Server 2008 with Windows Installer 4.5 installed\n     c. Windows Server 2008 SP2\nsetup /PrepareSchema\nPrepare AD:\nDomain account and member of enterprise admins.\nMachine in which you extend schema must be:\n1.  On the same domain and active directory site as the schema master server\n2.  One of the following:\n     a.  Windows Server 2003 SP2 with Windows Installer 4.5 installed\n     b.  Windows Server 2008 with Windows Installer 4.5 installed\n     c. Windows Server 2008 SP2\nsetup /PrepareAD\nWindows installer 4.5 - http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=5a58b56f-60b6-4412-95b9-54d056d6f9f4