Windows 2003 Domain Rename Question

We are currently planning to rename our domain from DOMAIN-NAME to DM.  We also have another branch location that has their own domain, THEIR-DOMAIN.  

What type of issues can I run into renaming our domain?
-Will users have to create a new workstation profile.  Example currently jdoe.DOMAIN-NAME and after domain rename and they log on, a new profile jdoe.DM will be created, making the users loose their settings/favorites?

-At our branch location, should we just change them from THEIR-DOMAIN to DM or would it be better to sub groups.  Our location A.DM and theirs B.DM?

I hope this makes some sense, let me know if you need more clarification.

Thanks!
Jesse003Asked:
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PberConnect With a Mentor Solutions ArchitectCommented:
I probably wouldn't create child domains either in your situation since you would need at least one more server (probably two if you want some fault tolerance).

You might want to consider putting a DC at the branch office (if you don't already have one).
The branch office you can configure as a site via the  Site and Services MMC.  This will allow the clients at the branch office to use Site awareness and pick a local DC for authentications etc.  It also allows for configurable replication of the DC's.
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PberSolutions ArchitectCommented:
Your biggest problem is probably going to be exchange and email.  The profile should be ok since it's based on SID of the user and that will not change even if you rename the user.

How are the two domains connected?  To me it looks like they are separate forests since your domain names are different.  

If they are separate domains with an external trusts, you don't need to rename both, but you can.  You will not be able to call them A.DM and B.DM unless they were both members of the same forest with a root (parent) domain of DM.  
i.e. Parent domain = DM
     DOMAIN-NAME = A.DM
     THEIR-DOMAIN = B.DM

Here are some links:
http://www.microsoft.com/technet/downloads/winsrvr/domainrename.mspx
http://www.msexchange.org/tutorials/Domain-Rename.html
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Jesse003Author Commented:
I'm starting to think that we should not rename our domain and just add the branch to our domian.  We currently have a T1 between us that has very little traffic.  I haven't found any real good reasons to create a child domain for them, unless you can convince me otherwise! :)
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