Exchange 2007 SP2 prerequisites to prep the domain

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