Honestly, I have no idea. Some blame lazy IT departments. I've heard it carries down from when IE was the only real option. Some, like the president of my company, refuse to acknowledge a changing world and still uses IE8 because he is incapable of adapting to new button placements. Some massive companies have to test everything 1000 ways before doing full rollouts of new software. It really doesn't make much sense to me. The necessary upkeep on my parents computer has diminished significantly since I installed chrome with the WOT extension. Maybe someone else knows. I am not particularly scared about said security issues personally or for my company. But it does make a great excuse with a slew pf reputable sources backing you up. Sensationalist scary press works out for the best sometimes.