Remove Child DC from Domain (unable to dcpromo)

Hi Guys

So i have lost two child domains and an exchange server today.

MAINDOAMIN
CHILD1
CHILD2
CHILD3 - CHILD4

So i have lost child 3, which had a child domain of its own child 4, the servers are physically gone, we have 0 backups.
i jus tneed to ensure that we maintain child 1 and 2 and main domain functionality.

i dont want to be loosing any more emails etc

each domain has its own exchange server.

my question is where do i start?
i need to remove child domains 3 and 4 i would normally do this by dcpromo but obviously that is not an option?

im server 2008 all round with the odd member server being 2012.
i inherited this system with no documentation so im in real need for some help.

i was lookng here https://support.microsoft.com/en-us/kb/230306
but as step 2 says "Verify that all servers for the domain have been demoted."

i am not sure because obviously they have not been demoted they are just gone.

any help will be greatly appreciated
deepslalliAsked:
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Dirk MareSystems Engineer (Acting IT Manager)Commented:
First start by removing the DC's for those domains.
Remove DC

Second remove all the child domains.
Remove child domain

You need to do metadata cleanup of all the DC and child domains, ensure no "old/missing" dc or child domain entry exists.
Video removing Metedata

DirkMare

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Will SzymkowskiSenior Solution ArchitectCommented:
You will also need to create new mailboxes on the Root domain or where you want to put them and import the data back into them as well.

Will.
deepslalliAuthor Commented:
Hi Dirk

I am running through step one;

http://www.isaacoben.com/2009/06/26/remove-a-demoted-or-failed-dc-from-active-directory-using-ntdsutil-exe/

however on step 12.

i am told that i must be connected to a server on the same domain. In this case this is not possible it was a 1 DC environment no other member servers or dc's for this particular child domain?

is their a work around? the same will be true for the other domain i need to remove. no longer any DC or member server's available.

please forgive the crude topology in paint but i have nothing else.

So as you can see

SG.DCDOMAIN.com - did have 3 DC's these are all gone. the entire office is gone no access in or out.
and SG's child is exactly the same.

so i have DCDomain / UK.DCDOMAIN / IN.DCDOMAIN remaining and im assuming i need to remove sg and my from the directory. without access to any server on them particular domains

*Do i delete the server manually from Ad sites & Services, then go on to delete the domain via ndsutil.exe?
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Seth SimmonsSr. Systems AdministratorCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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Windows Server 2008

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