Presently we have a 2003 Active Directory domain in native mode. We have a project on tap and needs to go from 2003 to 2012.
We have 11 sites, 2 forests (1 forest is a parent domain with 6 child domains and the other is 1 domain).
We have a lot of group policies, file servers with various permissions and groups. 30 or so DC's etc.
The admins and myself are really nervous about this.
1) Some say keep the same domain xyz.loc, collapse all the child domains (xxx.xyz.loc) into it, and migrate the other forest that has 1 domain into xyz.loc. Upgrade all DC's and be done
2) Some say create a entirely new domain from scratch, create new users, recreate groups, permissions, group policies etc., New DC's etc.
3) We're also upgrading our Exchange server from 2003 to 2007 or 2013
We have over 2000 users, and it's a complicated setup. Our users can't be inconveniced much. We run a 24-7 shop and it's healthcare. I need to go to 2012 but I can't have this drag out months and months.
Advice and direction needed.