for me to migrate to 2008R2 domain functional level (adding 2008R2 Server), is it necessary to demote or remove my existing 2003 DCs?
I have two that are used for various functions, and I have read several places where they recomend you remove your 2003 DCs, and also have read where it is not a problem to leave them, just wanted to know what the peeps around here think.