I was having some issues with my 2012R2 Essentials DC running as a VM on 2012 Hyper-V. I have redone and migrated to an identical 2012R2 Essentials VM DC with the same domain (Different computer name and IP). As soon as everything it finished I will junk the original VM. I am not quite sure the proper steps to 'switch over' the exchange 2013 server though. It was also running as a VM on the same hyper-v. Just not sure how to 'attach it' to the new DC. Any guidance would be appreciated.