I'm transitioning from Exchange 2003 to 2010. everything checks out ok during the Readiness Checks where it checks the current states of your system to see if it is ready for Exchange 2010 and everything in all categories are good. The only problem is under Organization Prerequisites I get an error that says:
"The forest functional level of the currecnt Acitve Directory forest is not Windows Server 2003 native or later. To install Exchange Server 2010 the forest functional level nust be at least windows server 2003 native."
Well I have only one server running AD and its windows server 2003 SP2 and it was set to mixed, but I went to AD domains and Trust and set it to Function Level: Windows 2003. I also rebooted and re-ran the install and I get the same error. I have 1 server with 2k3 SP2 (Active Directory) now running functional level Windows 2003 and I have 1 Windows 2003 member server running Exchange 2003 SP2, and I have 2 Windows 2008 R2 x64 SP1 member servers that will be for exchange 2010. I don't understand why the error keeps coming when I'm running Functional Level Windows 2003 which was the highest and no longer running mixed. Any help will be greatly appreciated.