I'm updating a 2000 network. There were two 2000 servers, one TS, one DC/Exch/SQL. I replaced the TS with new, scrubbed and loaded the old TS server with 2003 and want to promote it so I have two dc's before I pull exchange and do an inplace upgrade on the third. I ran adprep on the domain with all three switches, '/forestprep' '/domainprep' and '/domainprep /gpprep'. All three ran successfully. I'm now trying to dcpromo the reloaded server but am getting an error message that I need to 'run adprep, the forest is not compatable'. I rebooted all three machines to make sure they sync policies and domain information. I tried to re-run adprep but got an error saying it already ran.
Help!!!! I can't find any info on this at M$ or google, all similar problems show different dcpromo error messages.