http://blogs.technet.com/markrussinovich/archive/2009/11/03/3291024.aspx
The New Best Practice It's a little surprising that the SID duplication issue has gone unquestioned for so long, but everyone has assumed that someone else knew exactly why it was a problem. To my chagrin, NewSID has never really done anything useful and there's no reason to miss it now that it's retired. Note that Sysprep resets other machine-specific state that, if duplicated, can cause problems for certain applications like Windows Server Update Services (WSUS), so Microsoft's support policy will still require cloned systems to be made unique with Sysprep This is a little surprising, but good to know and it is written by the guy who wrote the NewSID code...(Mark Russinovich) Read the whole article if your curious. ,Josh ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~