Attempting to uninstall SBS '03 acts like it's installing; gives trust relationship warning.

I am in the process of migrating a network from SBS '03 to Server '12 and Exchange '13.  The Server '12 box is already online and has had the FSMO roles replicated to it, and I've already migrated all of the mail roles from Exchange '03 to a temporary Exchange '10 box.  I am now trying to uninstall Exchange '03.  

When I go to Add/Remove Programs and click on Change/Remove for Windows Small Business Server 2003, it brings up the requirements and has two errors:

--This server has a trust relationship with <existing domain>.local.
--Windows Small Business Server 2003 cannot be installed on a domain controller that is not the assigned the operations master roles.  

On the SBS '03 Server or on the '12 Server, when I go to Active Directory Domains and Trusts, right click on the domain, go to Properties and then the Trusts tab, there are no outgoing trusts or incoming trusts, so I'm not sure what to remove.

The second error is presumably because I moved the FSMO roles to the '12 Server.  

The wording of the Setup Requirements suggests that it's trying to INSTALL SBS '03, not uninstall it.  I could transfer the FSMO roles back to the '03 Server temporarily, but I feel like that's not a good idea.  Even so, that wouldn't get rid of the trust relationship error.  

I realize that I can uninstall Exchange manually, but I'd rather not resort to ripping it out of the SBS '03 box unless absolutely necessary.  How should I proceed?
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SINC_dmackAuthor Commented:
I have already found this article:

It details modifying the contents of a sitxxxx.tmp folder, but that folder does not exist anywhere on the old server's C: drive after running SBS Setup.

I don't feel comfortable doing Method 2: Change the GUID on the replica domain controllers.  That seems like too much of a risk of breaking other stuff, when all I want to do is uninstall Exchange '03.  So far, everyone who I've seen reference the article has said that Method 1 works for them; nobody has even mentioned trying Method 2, much less confirming that it works.
SINC_dmackAuthor Commented:
I went ahead and did a manual install as described here:

The process went smoothly.  I was able to install Exchange '13 without the "you can't install Exchange '13 if any Exchange '03 servers still exist" error, and I was able to demote the SBS '03 box to a domain member.

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