Too much does not work - so why bother
Far far too much does not work - esp. Internal company intranet stuff - so why bother.
The world has moved on to Chrome and Firefox (through diminishhing in significance), and Safari on IOS mobile and Mac. For Internal Comany stuff - assuming it has not already broken Internet Explorer 11 on Windows 10 is becoming the new corporate desktop standard (after Windows 7 and IE10) for legacy stuff, and Chrone for Google G-Suite and the numerous othher companies plugged into this ecosystem.