Properly manually remove last (only) Exchange 2003 server from a (once) mixed Exchange 2003-2007 environment

Okay, so here we have another one of *THESE* situations ...

So I took over support for a client about a year ago, and almost immediately I noticed that a previous technician had installed a new Exchange 2007 server that was working okay ... and that there were numerous references throughout the DC and Exchange 2007 server (including in Active Directory) to an old Exchange 2003 server (the only Exchange 2003 server that had ever been in use at the client) that had been disconnected (not decommissioned properly) and removed from the premises in Active Directory.

I plan to deploy a new Server 2012 R2 server running Exchange 2013 within six months, but I would like to first make sure that all traces of the Exchange 2003 server and all Exchange 2003-specific components are properly removed.

Remember: the old Exchange 2003 server has already long since been removed from the premises.  There is no way to get it back.

Would anybody familiar with properly manually removing the last Exchange 2003 server in a mixed (not really) 2003-2007 environment be able to point me towards any resources, instructions, and/or guides for doing so?

(I have done several Exchange 2007-to-2013 and Exchange 2003-to-2013 transitions, so I am familiar with the process of what needs to be done *IF* the old server is still available.)
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AmitIT ArchitectCommented:
Your only option left is to use ADSITEdit tool to remove 2003 server. Read this:

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Windows Server 2003

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