I am looking at a Microsoft article for Operating System Property Values , and it seems that both Windows Server 2008 R2 and Windows 7 VersionNTmatter 601. I see in the comments to the article what you should use MsiNTProductTypeto distinguish between the two.
So, if I wanted to allow the installation of the 2008 R2 server (and not Windows 7), this would be the right condition:
MsiNTProductType > 1 AND VersionNT = 601
This will allow me any Windows 2008 R2 PC that is a domain controller or server (which Windows 7 is not?)
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