Company splitting up. Need advice on splitting AD domain.

We currently have an AD that consists of a single forest root with two DNS namespaces with transitive trusts between the two.  This was due to an acquisition several years ago.   This  acquisition may be splitting off and forming their own company and would like to know how they can retain their AD objects (user accounts, etc.) if and when we split.   To complicate matters we also have an Exchange environment in which there is one Exchange Org with an Exchange server in each of the DNS namespaces.  Is there any way to split off the non-forest root DNS namespace but yet allow them to keep their AD objects?
drussell01Asked:
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Jamie McKillopConnect With a Mentor IT ManagerCommented:
Hello,

If you have a single forest, your only option is to create a new forest for the company that is separating and then migrate all their objects to the new forest. Same with Exchange. You will need to install a new Exchange org in the new forest and migrate the Exchange objects you want to go with them.

-JJ
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