It's the sort of question that needs more data than just what I think about it. But for a gut feeling -- no, not at all. No one wants to support old browsers,

It's the sort of question that needs more data than just what I think about it. But for a gut feeling -- no, not at all. No one wants to support old browsers, and if you pay for custom site development, it's a common practice to add seriously high extra fees if that's a requirement. And so most sites don't support them. But all of this doesn't really encourage or discourage a business that has really poor options around upgrading. In some ways it's just irrelevant; they're using the browser as a tool for employees to complete specific tasks, and if Facebook doesn't work (but the expensive internal tools do) that's just fine. The two domains collide when there are new, external tools that are introduced to the environment. ...and this is why we need some support of old IE, because we really don't want our sales pitch to include "...but you'll need to also spend untold amounts of cash and effort to upgrade your browsers, first".