Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

We recently acquired a company running a very similar domain to ours, and we would like to merge the company into our domain.

The question is, can we provide a domain alias and map that to our domain (e.g. ComapnyA\username -> CompanyB\username) meaning we don't have to implement the new domain on the old machines.

Or do we have to maintain 2 domain forests?

The acquired company uses a username format of JoeB wheras we use JBloggs can we map the users to a specific user on the domain?

share|improve this question
up vote 2 down vote accepted

In the short term, clearly a trust is the way to go. In the long term, you are almost certainly going to have to migrate their AD to yours. You will probably do it using the Active Directory Migration Tool and the Password Export Server.

I suggest that you read this document Microsoft on how to use the ADMT and restructuring domains.

share|improve this answer

This isn't a strong suit for me, but you might try looking into AD Sites and Services. There is a way that you can trust a domain and it would essentially be an extension of your domain. I dont know if it would be able to login with JoeB on JBloggs network. Just a thought.

share|improve this answer

Probably you want to cresate a Trust between domains. MS KB on this. Probaly you'll need to investigate this more as it's is supposed to be quite painfull to do this properly.

share|improve this answer
+1 for this being painful – JamesBarnett May 27 '11 at 13:36

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.