We currently are our own domain/forest(us.xx). Our parent company, wants us to migrate to their domain(intra.xx). The domains are similar in name only, but they are not part of the same forest.
The issue that we face is how to migrate users from (us.xx) to (intra.xx). In (us.xx), users are in the format of (lastnamefirstinital), in the target domain, it is a different format. In the target domain, the all user accounts already exist(in the new naming format).
How can we migrate to this new domain(machines/people), and not have things blow up? Will user’s profiles remain the same on their computers, and how?