I just joined a company. They are currently using a 2003 domain controller, one 2012 file server, and a 2008 server.
I need to do a total upgrade. I don't want to keep the 2003 domain functional level. How best can I upgrade their domain controller to server 2012 or 2016?
Do I just dis-join all current users from the 2003 domain and do a fresh installation of server 2012 or 2016 and make it the domain controller. Then add all 20 users back to the domain?
Please I need your advise.