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.