You may have noticed that the Compatibility View button which used to be in the Address Bar in IE8 may or may not be there in IE9. If you're missing it, you should now be able to find it under Developer Tools. Just hit F12 and you should see:
Very nice that it support 7 and 8.
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Thank you! Such a simple fix, but the MS Answers page mentioned nothing of the F12 button. Kudos Kon!
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psst... F12 also activates Firebug and Chrome's dev toolbar.
Do you have to hit f12 every time you need compatibility view?