When IE 9 shipped as a release candidate, I announced our plans supporting it here. Since then, we have been able to test and resolve all the issues we discovered with IE 9. Not only that, but during the same time Firefox emerged from it's beta to RTM state, and we added that in our browser testing as well.
I wanted to let you know that with the service release of 10.1, 10.2 & 10.3 that is going to ship next week…