You need to create a new domain in your forest. You cannot join the domains
from the other companies to your existing forest.
So you need to run DCPROMO on a server that will become a DC and first
select domain controller for a new domain. You then need to select domain
tree in an existing forest. This will allow you to specify a domain name
that is not a child of your existing domain.
Once the new domain is created you must use the Active Directory Migration
Tool (ADMT) from Microsoft to migrate the users, computers and groups etc to
the new domain. Or you can manually create users and join computers if there
are just a few.
An important note however. Do not create the new domain in your existing
forest with the same name as the existing domain in the company you are
merging with. You would not be able to create a trust to this domain and
therefore a migration would not be possible. You would also have many other
problems with DNS etc.
Best regards
Joe Dunn
MBCS, MCITP:EA, MCSE, CCNA
"raz4183" wrote:
> We are a simple single domain using 2003 Server. Our company is now merging
> with several other companies. Using AD how do I add domains of the other
> companies and yet have each domain be separate from the others? For example
> our domain would be xyz.com, now I need to add abc.com to our AD. I don't
> want to have abc.xyz.com - I want them both to be separate but using the same
> AD. I'm told there is an article in Microsoft on how to setup multiple
> domains in a single AD environment but I haven't found it yet.
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