In my previous question titled "Adding a domain controller-moving FSMO Roles-Demoting Old Domain Controller
Posted on 2018-10-29 " I completed all the steps to add the new 2012 domain controller and I moved all FSMO roles to it.
I now have two Server 2012 domain controllers and one Server 2003 domain controller. I'm going to demote the 2003 DC and want to raise the domain level which is now 2003. Can I raise it from 2003 to 2012 once the 2003 DC is demoted?