My guess is either. Super conservative IT department. Lots of users only need a handful of websites to do their job, as long as those work why bother changing

My guess is either. Super conservative IT department. Lots of users only need a handful of websites to do their job, as long as those work why bother changing anything? Some 3rd party application which might work on IE8 but only "supports" IE7 People who turned off automatic updates years ago because they slowed their computer down.