Nella mia esperienza lo sapevo già, ma in questo articolo Mark Russinovich, guru Microsoft, spiega perche’ la duplicazione del SID macchina non e’ un problema in un dominio, e perchè non si deve cambiare.
Alla faccia dei miei colleghi europei che insistono a farmi cambiare il SID senza motivo.

in riferimento a:

“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.”
– The Machine SID Duplication Myth (and Why Sysprep Matters) – Mark’s Blog – Site Home – TechNet Blogs (visualizza su Google Sidewiki)