I call foul
"Updating these browsers could break enterprise apps."
As a 10-year enterprise app developer, I call foul. If the apps break, hire some developers to update them or replace them. It sounds to me like they don't want to mess up the interface. It's quite simple to update the application interface (compared to the business logic that is much more important and critical to the application).
This excuse has been trotted out time and time again. Are programmers that expensive or are companies that uncomfortable with making updates?