i currently have 2 domains. 1 top level domain which holds the schema and DNM. And 1 thats hold the RID, infrastructure and PDC roles.
Currently all levels are 2003 native and i need to upgrade them to 2008.
can anyone please explain the best process, do i need a 2008 server in each domain?
should i do the holding domain first, do i also need to do the lower domain?
any advice welcome