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The suggested document explains a lot. Thank you.
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I had an old server that was running Exchange 2007 but had not been put to use. When uninstalling I had to use the setup.com method.<br />
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Exchange was duly removed but so was Domain Users on the DC. What did I do wrong?<br />
<br />
I have got out of the situation but it was messy for a while.
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I had an old server that was running Exchange 2007 but had not been put to use. When uninstalling I had to use the setup.com method.

Exchange was duly removed but so was Domain Users on the DC. What did I do wrong?

I have got out of the situation but it was messy for a while.

Exchange 2007 uninstall - Domain Users deleted.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.