If you’ve ever worried that someone was editing your shared documents behind your back, Microsoft might just set your mind at ease.

The folks in Redmond are rolling out an update to OneDrive that tells you when someone is editing a file you’ve shared, whether through a mobile notification or a daily summary email — you’ll know if someone is diving into that quarterly report a little too soon, or if that spreadsheet will be ready for tomorrow. Only some users will see these alerts at first, but they should be “widely available” in the weeks ahead.
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https://www.engadget.com/2015/08/11/onedrive-editing-alerts/