with millions of users, it will be a long time before they drop Internet Explorer 10 or 11 I can't see them not supporting those 2 at least in the near or distant future.
Microsoft Edge is being re-vamped to the Chromium rendering engine thingy, they have already leaked it last month ( and the word is that it will give Google Chrome a run for its money)
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Learning by doing. Responsive Site Designer Tutorials
Learning by doing. Responsive Site Designer Tutorials