All they are saying here is "these are the browsers/OSes we can offer support for, and that we test our site with". I mean they specifically say:

> Some features and functions may not operate properly with unsupported browser versions.

I don't understand why folks are so surprised this works elsewhere, or why anyone is getting super upset about this. If they were filtering based on user agent and explicitly preventing it from working for you when it otherwise probably would, then I could see the issue (ahem Apple icloud, anyone?). But this isn't that.