[EB66]

Unfortunately, IE11 is still quite prevalent in large enterprise organization with IT departments that control which browsers are installed on desktops across the org. There's a lot of bureaucracy and legacy apps to contend with before making a change to swap out a browser. For example, IT might first have to certify that a browser change would not break usability with any number of old internal company web apps.

There are also quite a number of Win32 apps with embedded browsers that are essentially running IE11. Depending on what Win32 control/plug-in was used to embed a web browser, those embedded web browsers might be stuck on IE11 indefinitely (until the authors of the Win32 app re-compile with an embedded web browser that uses Edge).