Run the Schema update from your Exchange server, not the domain controller. As long as the user account is a member of Schema Admins & Enterprise Admins you should be fine. I don't believe you need to ...
I've got a Forest/Domain running at 2003 with Server 2008 domain controllers. I want to add my first 2008 R2 domain controller, so I need to extend the forest/domain schema. On the off chance the ...