It would be much better progress if they could use the latest IE on whatever version of windows, rather than being forced develop for the lowest common denominator.
Chrome has it right, it's always the latest version, and firefox is better than it used to be, but even then they didn't say "sorry, you need the latest windows to use this version, here, have this 4 year old version instead"
It's ridiculous, and I can't think of one valid technical reason for it