I just retired the last of my 2003 DC's and I want to raise my forest functionality level to 2008. We have many apps that are heavily integrated into LDAP and a few SQL servers that are still SQL Server 2000. Would raising to 2008 effect any of these? I don't have any child domains and my Exchange server is 2007 SP1, so I doubt there would be any issues there. I have, of course, already done the schema upgrades to version 47 and it didn't break anything. Anyone have any insight?