>>mfwit+(OP)
I changed it back to use default browser. It took all of 60 seconds to google the answer. They totally should take a calculated risk like this in order to gain more market share. Exercising control over software defaults rarely causes users to abandon a product entirely. The pain of changing the default back is much less than the pain of finding a new tool. Microsoft will not lose Outlook users by doing this. They will gain Edge users though. Yes, they will enrage the craftspeople who aren't a part of THE GRID, but that still won't affect the bottom line enough to matter.