SOLVED: IE11 – You’re seeing Basic Mail because you’re using an unsupported Internet browser

On SOME Windows 10 machines, I have seen “You’re seeing Basic Mail because you’re using an unsupported Internet browser” and both Yahoo AND Yahoo Mail look like crap.  This is caused by Internet Explorer trying to run Yahoo pages in Compatibility Mode, basically in an IE7 mode.  “Wait a minute” you say, “I checked my Compatibility Mode entries and Yahoo is not in there”.  To which I say you are correct!  However, Microsoft has listed…