Earlier quoted context omitted.
IE 7 and 8 are not available in the installer; I'm running Win7 x64 with IE 9.0 installed. Falling back to XP Mode for now.
So if you go to Tools > Developer Tools the browser modes for IE 7 and 8 are not there?
Most importantly, why does my page not work in IE7, even though it works in IE7 mode in IE9?
http://stackoverflow.com/questions/5993222/why-does-my-page-...
IE9’s emulation of older IE document modes makes this easier but those emulations are not exact.
http://blogs.msdn.com/b/ie/archive/2011/02/04/testing-multip...