After everyone else has already shipped. Typical. Better late than never I guess.
At my work we have stopped testing on MS browsers. The higher ups have decided that it's not worth the time to support any version of IE and Edge. If it works on those browsers, great. But if it doesn't we won't do anything to address it. We started this about a year ago and so far nobody has said anything. Of course we are fortunate that we are not selling anything so we don't have to worry about things like lost sales.