We were about to install a new Server 2012 and the historic SBS 2008 died the day before.
The original server was on Domain ABC1 and the new server will be on ABC2.
Can I add the PC to the new Domain as I can't contact the old server to remove them properly.
I have run a test and it appears to work but is still using the old DHCP, the IP number and ranges are effectively identical.
All data, per se, has been saved.
To remove a system from a do in you do not need the DC. (Properties of computer, advanced settings, computer name, change to workgroup to disjoin) or rerun the wizard to join the new domain.