Starting this month, Microsoft will start to retire Internet Explorer 11. Anyone, who makes websites would always just have to take a pause if IE11 was  a requirement of the project. Microsoft put out a video explaining how to upgrade for business and compatibility with legacy apps. I'm glad I watched the video because it is a reminder that our ecosystem is massive and there are tons of apps running on all different types of systems out there. I didn't know there could still be active IE legacy apps floating around out there. But, if they are older enterprise apps that still work there is no motivation to upgrade.