At my previous company. A well know global airlines we just put out a tender for cargo management and loading systems. All the vendors were ie6 compliant but did not certify for ie7 or any other browser. I tested many of the demo applications on ie7 and on firefox and they totally rendered incorrectly.

Even at this time corporations are not upgrading and i guess they wont as long as vendors continue to provide ie6 compliant applications without support for any others. Goes to show how slow corporations move these days, even for something as simple as a browser (in comparision to other upgrades they make).