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http://connect.microsoft.com/directory/non-feedback It's actually on the list of items not currently "receiving feedback" whatever that means.

That is because MS just released IE10 for Win7.

This is the url for the feedback form. It redirects to a login page if you're not logged in.

If you are signed in with a Microsoft account everything seems to work. Terrible UX though. Nothing indicates you need to sign in.