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System variable: OS having missing data for some surveys?

Just a curiosity question more than anything.

Why is that all system variables populate with their respective data: User Agent / Browser / IP Address, etc. but the Operating System for some respondents is missing? I noticed that the Apple products are the reason but thought OS information would still be saved in the OS system field?
asked Apr 18, 2017 by Paul Moon Platinum (98,670 points)

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