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I have another problem with using webmail on Windows 10 / MS Edge and be nice if someone can confirm!!
Got myself a 4K monitor and I am running Windows at 150% display scaling, and of course Edge sets it zoom level to 150%.
I noticed the webmail drag & drop does not account for the scaling correctly, and further you move from the vertical position of the original item your are dragging the further away the hotspot of the drag moves away from the mouse.