I won't give you a name - but I know of a very large international company (hundreds off offices, tens of thousands of employees, etc.) that runs older versions of IE across much of their network. Some of it is budgets for testing newer versions. Some of it has to do with specific applications that are business-critical, but only work on older IE versions and haven't been updated / upgraded to run on new versions of modern browsers. It's easy to say "just upgrade" but large organizations just don't operate that way unfortunately.