We are trying to add a 2008 server into our active directory. Currently we have a forest domain with FDC1 and a backups domain controller to this called FDC2.
Then below that we have user domain controllers for each branch that users use for signing on. These are DC1, DC2, DC3. Currently they have been 2003 servers up until now and we have to add a 2008.
I am on FDC1 and running adprep \forestprep to which I get the following error attached: