Active Directory break away?

So, two sites with DNS and AD servers going away.
Main site remaining with own DNS and AD.
WAN communication is over s2s hw BOVPN firewall/routers.
Single forest, email server at main site.

The two sites going away, sold off, what would be the best way to remit control to new owners?

I say, copy emails to separate db and hand it over to new owners when ready.
Demote (dcpromo) servers ; ensuring AD health first.
no reason they should want to create a trust relationship between domains(forest).
Two separate companies not related.  

Anyone have other ideas/bullet points?
dee30Asked:
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Will SzymkowskiSenior Solution ArchitectCommented:
The easiest approch would be the following...
- Export all mailboxes to PST for the new company
- Demote the DC's in the Sites
- Remove all of the client from the domain

You will not be able to give them rights over these servers unless you have a forest trust between the companies. This forest trust will need to remain.

If the ultimate outcome is that they are now sold off and no longer a part of the domain then doing what i have explained above would be the most suitable.

If this was an aquisition or merging then you could have used the ADMT with a forest trust merging the 2 domains. However this is not the case.

Will.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
I recommend the following:

1.  Create a new domain and migrate users to the new domain (you could also migrate passwords but to keep it simple, keep the same password and configure it to change on first logon)
2.  Copy all files/data to a new server for them.  Use Robocopy to keep the security
3.  Configure Exchange to not accept email as of the closing date
4.  Export all mailboxes to PST and give it to the new owner
5.  Demote existing PDCs
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
In addition to above, you need trust relationship to copy users using ADMT but when completed, delete the trust.
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dee30Author Commented:
Oh yeah, didn't think about the user account/profiles. If I wanted to be 'kind' and ensure profiles aren't lost I guess the only is to establish a AD trust temp between domains and allow them ADMT to migrate, then remove trust and cleanup the old accounts when done, huh?

I use the term kind loosely... :)

Thank you.
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dee30Author Commented:
Other questions, the ADMT is installed and used on source AD server right or does ADMT have to also be on the target(receiving) AD in order to complete the migration(ed) user accounts?  I think so if memory serves me right....
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
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Will SzymkowskiSenior Solution ArchitectCommented:
ADMT is installed on a memeber server in the Source Domain. You then move objects to a Trusting Domain that you have established. Personally, depending on how many objects you are actually moving you might be better off to remove machines from the domain and re-add them to the other new domain.

Just an FYI domain controllers that will be going to the new domain have to be DEMOTED. You cannot move a domain controller to another domian using the ADMT.

Will.
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dee30Author Commented:
Will, thanks for the last note there... yes aware AD can't be moved with ADMT tool.  Profiles are best kept and in order to make the transition as easy as possible and work env fat client mission ciritical apps to remain as constant in their setup as possible; little tweaking.
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dee30Author Commented:
Thank you for feedback and options.
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