How to determine what OS is being used ( Windows 7)

Occasional Visitor

Is there a way in Azure log Analytics to determine what OS a user is using?  I am trying to find users using Windows 7.   I thought the following statement would do it but I am getting false positives because it also brings back users on a newer OS but on Server 2008 machine .  


| where csUserAgent contains  "Windows+NT+6.1"

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