An article by Mark Russinovich specifying why New SID is irrelevent :
The reason that I began considering NewSID for retirement is that, although people generally reported success with it on Windows Vista, I hadn’t fully tested it myself and I got occasional reports that some Windows component would fail after NewSID was used. When I set out to look into the reports I took a step back to understand how duplicate SIDs could cause problems, a belief that I had taken on faith like everyone else. The more I thought about it, the more I became convinced that machine SID duplication – having multiple computers with the same machine SID – doesn’t pose any problem, security or otherwise. I took my conclusion to the Windows security and deployment teams and no one could come up with a scenario where two systems with the same machine SID, whether in a Workgroup or a Domain, would cause an issue. At that point the decision to retire NewSID became obvious.
http://blogs.technet.com/b/markrussinovich/archive/2009/11/03/3291024.aspx
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