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I'm genuinely curious how this app that works with IE9 can't work in IE10. From my experience, Microsoft has put a lot of effort into making IE backwards compat

I'm genuinely curious how this app that works with IE9 can't work in IE10. From my experience, Microsoft has put a lot of effort into making IE backwards compatible. You might have to force IE into a specific mode, but I can't imagine an app for IE9 not working at all in IE10.

wvenable 13y ago
We've been in the tough situation where some business/banking websites only worked in IE9 while others that we were having trouble with only started working properly in IE10. Ultimately we rolled back to IE9 because the former out numbered the latter and because IE9 is still the standard version of our corporate image. IE10 snuck onto a few servers and unrestricted desktops because it was installed silently through Windows Update along with the normal patches. That did give us the unexpected opportunity to test it out with real users.