MS provides a free IE Testing virtual machines that have all IE versions available. There are definitely ways for Linux/MacOS devs to test IE in their environme

MS provides a free IE Testing virtual machines that have all IE versions available. There are definitely ways for Linux/MacOS devs to test IE in their environment so that's not true all. Although, I've gotten so sick of IE quirks that at this point, I test against Firefox/Chrome and just assume that the newer IE's will work.