All FSMO roles are held by 2003 DCs. Domain/Forest functional level is Windows Server 2003. I am an enterprise admin, and all commands are being run as administrator. I am a new user on this forum. I can't submit links, so I'll post the title of the threads I've used so far.
I have a 2008 R2 DC that still shows a trust that we removed months ago. From a thread titled, "Old Domain Trusts Still Showing up on 2008 R2 DC", I tried this command:
netdom trust mydomain /domain:orphandomain /oneside:trusted /remove /force
Like the fellow in that thread, "netdom query trust" still returns the orphaned domain.
I followed Wilson's next response (marked as the answer), and I do not see a trusted domains class under CN=System in ADSI edit. I am connecting to the offending DC by the way.
I then tried to follow a thread titled, "Problems with trust removal." This thread advises to use ldp.exe to remove the trust. I get no results from the 2nd, or 3rd searches.