In testing on Windows 7 and Server 2008R2, I can’t get the operating system product type inspector to return a valid result. Is it deprecated? Or maybe it only works on pre-2003 versions?
I feel like this same info is in WMI
https://bigfix.me/relevance/details/3002555
tuple string items (unique values of integer values of selects "DomainRole from Win32_ComputerSystem" of wmis) of ("Standalone Workstation, Member Workstation, Standalone Server, Member Server, Backup Domain Controller, Primary Domain Controller")
This is a bit more of an unusual inspector as you have to use another inspector to compare to. So on my Windows 2012 R2 machine:
Q: nt workstation product type = product type of operating system
A: False
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Oh, that is weird. And sure enough, on my Windows 7 machine:
q: (nt server product type = product type of operating system) = False
A: True
I feel like this is slightly more intuitive:
(product type of operating system != nt server product type)
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That is the most common one used to prevent server updates 
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Oddly enough I was looking into this as relevance criteria for a group that holds only servers.
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Remember there are two types of server returns you can get, we have unique values to indicate a domain controller as well
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