A nasty situation no doubt, but manageable. What I would do is: 0. Rename IE to 'intranet'. 1. Configure IE to only access Intranet. 2. Switch everyone to chro

A nasty situation no doubt, but manageable. What I would do is: 0. Rename IE to 'intranet'. 1. Configure IE to only access Intranet. 2. Switch everyone to chrome/firefox, keep bookmarks, etc 3. Hire some university students to temp man the support line as you are flooded with support requests. As I said a nasty situation. Perhaps it would be best to spread a rumour that someone was fired thanks to IE. That way you are not evil IT getting in the way of everyone's job.