This post help you to check your data usage on Windows 8.1 OS machines.
Click or tap on the Wifi icon on the taskbar.
A sidebar opens. RIght click on your Wifi NetWork name.
The above picture which shows the estimated usage the amount consumed data, metered connection always ask permission to download e.g Outlook Web app(If you use settings as metered connection, this app ask can i download from sever now).
That’s all folks.
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