Steps on decomissioning an AD domain

I am currently working on a project to collapse an old domain of a company that we purchased several years ago and have since moved everything off.

To this point I have removed all of their domain controllers except the last one. I have checked the DNS console to see if any computers have registered entries. The last entry was some time back in 2011. All clients are getting their AD/DHCP/DNS/File Shares/etc from the new domain.

We currently have a forest trust configured with the domain I am about remove. Im thinking the trust should be removed before starting the DCpromo process. I was planning on breaking the trust from the domain we are keeping but not sure if it actually matters where I break the trust.

Are there any other things that I should be looking at? Or do you have a checklist for decomissioning an old domain?

Any help is appreciated.
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Joseph DalyAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
You should remove the trust from the old domain to new domain first, as you may get error messages when trying to decommission the old domain.

If this is the last domain in the forest you can simply use dcpromo to decommission the last domain controller. Just remmeber if you have a need to get back into the machine for any reason, make sure that you have a local admin account that you know the username and password to. If you do not create one before decommissioning.

Will.
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