So I have an Exchange 2013 box and DC that I would like to change back to my default site. Is there anything I need to do before doing this? Right now I have an Exchange 2013 box with Mbx and CAS roles in the first site. I am moving the second Exchange back to the first default site so I can have some HA with my CAS boxes (as budget allows). There are no DAGs set up between the two yet. Please advise.