Windows Server 2008 ADPREP.

We’re planning to upgrade our existing 2003 Server AD as described here, so that we can then add a read only 2008 R2 AD DC. Based on the wording in the article, it appears we may first need a non read-only 2008 Server based DC in the domain before we’re able to add a read-only copy. It was our original intent to add the single RO 2008 Server based DC to the existing single 2003 Server forest root DC.