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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. <br />
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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. <br />
<br />
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. <br />
<br />
Are there any other things that I should be looking at? Or do you have a checklist for decomissioning an old domain? <br />
<br />
Any help is appreciated.
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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.

Steps on decomissioning an AD domain

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.