I guess my question is why isn't the support built into IE 9 or added since with the release of SP 2013 IE 9 was the latest version of the browser? It can't be a dependency on Office 2013 since this works with Firefox and Chrome. A lot of businesses can't upgrade on the fly to the latest browsers due to compatability issues with 3rd party products which we require testing. I'm trying to understand what is "missing" in IE 9.