Do I need to extend the schema again if I create new Configuration Manager sites or add computers from new domains?
No. Active Directory schema extensions are for the entire forest, so you need to extend the schema for Configuration Manager only once if your Configuration Manager hierarchy is contained within the forest. The only exception is if you create a new primary site in another forest, and you want this new site to publish to Active Directory Domain Services. In this scenario, extend the schema in the new forest (and configure the security permissions for the System Management container). Question: Do I need to extend the schema again for Configuration Manager after upgrading to a later version of Configuration Manager (for example, Configuration Manager SP2) or after raising my Active Directory domain or forest functional level? Answer: No. If you have extended the Active Directory schema for Configuration Manager, you do not need to extend it again for these scenarios. However, if you’re upgrading from SMS 2003 to Configuration Manager, then you should extend the schema for Configuration M
