I have a domain with two 2000 dc's and two 2003 dc's. I want to retire the 2000 dc's and add 2008. I have setup a new 2008 server and joined domain. Do i just need to update the schema with adprep, then dcpromo up the 2008 box and then dcpromo down the 2000 boxes? Can i run adprep on any dc?