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Rename Windows 2012 AD server

I have about 10 servers. Everything from win 2003 to 2012. Soon I must replace two of them.
The problem is that one of them is a Windows 2003 AD server with all the FSMO roles.
And it works as the main file server.
Now they want me to replace it with a Windows 2012 AD server (already installed)
And the new server must have the same name and IP as the old 2003 server.
And to make it more interesting, the old server must remain as a demoted member server (with a new name and IP) because it holds a program that I can´t move.
Is it possible to rename a Windows 2012 AD server to a name already used?
And how do I do this the best way?

/Peter
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Cliff Galiher
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Renaming domain controllers is very ugly and should only be done in the most extreme of circumstances. If there is *any* way to avoid it, do so.

2003 is also end of life. Beyond the many problems that demoting a DC often causes to applications still on the server, the fact that 2003 will no longer get security patches should scare you immensely. Find a way to move the apps. At * least* to 2008. You'll avoid multiple issues with that simple decision.
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I thought it was easier to rename a Win 2012 AD server?
And it is a lot of references/links to the old server (name and IP)

About the 2003 server, it must remain but only until we replaced the program on it and it will take a few months.
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Will Szymkowski
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Of course I have to find out if the application is dependent on name and IP. But I do not think so.
(The support team is working on it now)
So I dont think that is my main problem.

My worries is about changing the names.