After raising my forest functional level from Windows Server 2000 to Windows Server 2003, I need to promote an existing trust between two domains in this forest from the external trust type to the forest trust type. As it seems that it is not possible to upgrade an existing trust, I will have to remove and recreate it. Could someone confirm this and tell me the risks for existing groups, policies, etc ? As an example, I have groups in one domain that have users from both domains and that I can't afford to loose...
One domain controller runs under Windows 2003 Server, the other one under 2008.