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

[Alanhaley98]

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 .  

W3CIISLog
| where csUserAgent contains  "Windows+NT+6.1"

[#2]

Maybe this helps :) https://docs.microsoft.com/en-us/azure/azure-monitor/reference/tables/deviceinfo