I hope you find this one interesting and have pleasure in solving it:
We created a fresh out of the box forest and domain for a client having replication problems with their old domain.
The new domain and forest was created using a vmware virtual machine. An exchange 2010 was configured on a physical box on this new domain. After this the old (and last) DC (a physical box) from the old domain, was demoted and joined to a workgroup, added to the new domain and promoted to a DC as well. Everything went well and all FSMO roles were transferred to the physical DC; DHCP DNS and Global catalog were all transfered as well and removed from the DC in vmware. All client computers are all pointing to the new DC in the physical server.
Of course, our goal is to demote the vmWare server and give other usage to it. The problem is that everytime we shut down the virtual DC, people stop being able to log in, exchange stops, ISA stops, everything stops!
So, after all this testing, it's obvious that we wouldn't try to simply demote the VM domain controller server to a simple member server without consulting you Gurus!
Can anyone help us out on this one?