Moved SBS 2003 Exchange to Office 365, SBS server dead, how to remove Exchange from AD?

Have an old SBS 2003 that lasted just long enough to get all the Exchange mailboxes moved to Office 365 and AD/files moved to a new server. Now the old SBS machine is in a reboot loop and I want to get the old SBS out of AD. What is going to be the best way to accomplish that? I know seizing the FDMO roles and removing the DC is easy enough, but not sure on Exchange.
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VB ITSSpecialist ConsultantCommented:
Is the SBS machine rebooting because you moved the FSMO roles off of it? If so, you can install this patch on the SBS 2003 server to extend the grace period from 7 days to 21 days:

As for removing the old SBS server, you'll want to uninstall Exchange from it completely first before you transfer all the roles off it (DHCP, RRAS, etc.), then demote it and decommission the server.
mvalpredaAuthor Commented:
The SBS is dead. Not able to do anything with it. Blue screen loop.
VB ITSSpecialist ConsultantCommented:
I see, so the steps in my previous post aren't really an option then unless you have a good recent backup of the SBS server (which I assume you don't). As long as you have moved everything off the old SBS server (files, shares, roles, FSMO etc.) then you shouldn't have any issues unless you plan on re-introducing an Exchange server into your environment.

Should you reach this bridge, you will need to remove the references to the old Exchange server before you can properly deploy a new one. Firstly, keep in mind that the recommended method of removing Exchange is via the Add/Remove Programs Control Panel applet. If you can't uninstall Exchange using this method for whatever reason (in this case a failed server) then you can use the steps in this link as a last resort:

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mvalpredaAuthor Commented:
What about all the extra AD attributes? Those won't be an issue?
VB ITSSpecialist ConsultantCommented:
Those attributes are part of the schema, the best you can do is clear them on all your user accounts but they'll still be there. Again, they really won't be an issue unless you plan on re-introducing an Exchange server into your environment, be it on-premises or cloud-based (via Active Directory integration).
mvalpredaAuthor Commented:
What would happen if in a few years we try to install Exchange again? As long as the Exchange server is removed through ADSIedit I should be okay?
VB ITSSpecialist ConsultantCommented:
That's correct. Again, I would only resort to removing an Exchange server through ADSI Edit as a last resort. If you have absolutely no available method to gracefully uninstall Exchange from your environment then ADSI Edit is the way to go.
mvalpredaAuthor Commented:
As I mentioned earlier, the SBS server is totally dead - hardware failure. It was nothing short of a miracle that we were able to migrate anything off this old machine.
VB ITSSpecialist ConsultantCommented:
Yep, understood. Just putting it out there for anyone else that may come across this question :)
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Windows Server 2003

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