I work at a big tech MNC right now. We have apps that still require IE6. These are global apps. This company is also lauded for some amazing tech. Sometimes it's just difficult to allocate the necessary resources to update an app, and sometimes it's not worth it. In other cases, all the people who made the app just moved on and there's insufficient documentation to know how the app works. The code analysis process alone would be atrocious, and companies prefer to put pressure on revenue-generating initiatives, not maintenance initiatives, because if it ain't broke, don't fix it. And this is why all our computers still have IE6 installed.... @@ Fortunately, I've also got Chrome and Firefox on here because I have admin rights.

edit: Given how long mainframes have been around, is it really that much of a stretch to say that these kind of legacy web apps could still be around for a few years yet, if they're really integrated deep into an organization's processes?