When I was with my old organization, we used to deploy operating system with the help of Ghost — an imaging technique. So, after completing the imaging process, we used to run newsid.exe to make the new installation unique in environment.
But surprisingly, the author of newsid has taken a decision to retire that decade old utility. Believe me, it is no more available at any MS websites. MS suggesting it’s customers to user sysprep instead of newsid as sysprep does lot more things which newsid will not.
You can refer to below URL to know reasons behind it’s retirement.