Today I was playing with EV 9 + Exchange 2010. I have found out I have no EV functionality in OWA. While checking EV OWA log at Client Access server I've found such entry:

[EVContext::IsValidBrowser] Returning: False

I tried then several browsers: IE 9, Firefox 9, Aurora (Firefox 11), Chrome 16.0.912.77. So, only IE 9 gave expected result.

Later I've checked Compatibility Chart and ensured only IE 7, 8 and 9 are supported. However I don't understand why EV cares about browser used by OWA if all presentation (e.g. browser dependent layer) is implemented by OWA