You need to prevent the sales.contoso.com and the manufacturing.contoso.com names from being used in authentication requests across the forest trust
You need to ensure that clients will only attempt to establish connections to the new AD RMS deployment
You need to ensure that the users who migrated to fabrikam.com can continue to access shared resources in contoso.com
You need to ensure that all Active Directory changes are replicated to all of the domain controllers in the forest within 30 minutes