I recently began working at an organization which had a W2K3 SP2 DC at a remote site which was running DNS, WINS, and is a global catalog server. The site was taken completely offline - unbeknownst to me by another party - afterwards I found out about the configuration of this DC. My question is this, I have two options, one, I can try to decommission this DC by manually removing it from AD, or two, I can change its IP address and move it to a new remote site - both physically and within AD. Since the DC has been disconnected for less than 30 days, I believe the second option is available even though it wasn't prepped for the move, however I'm not sure how what the ramifications would be to do this and whether its as simple as changing the IP and rebooting it - after I move it to the new site with "Active Directory Sites and Services".
Any recommendations regarding which option would be the simplest to pursue - plus with the less amount of risk of problems - and the steps to accomplish would be appreciated.