Migrating domain controller functions to a new domain controller
After running promoting the new server to a domain controller (running dcpromo.exe)… On the new domain controller, follow these steps to migrate domain operations.
1) Open Active Directory Users and Computers
2) Right click on the domain, and go to “operations masters”
3) Each of the 3 tabs has a “change” button, click it to delagate the role to the new domain controller
4) Next, open Active Directory Domains and Trusts
5) Right click on “Active Directory Domains and Trusts” and go to “operations masters”
6) Repeat the change command from above
7) Wait several hours for the process to sync, and then you are free to remove the old domain controller from your network