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For Metro style apps, controls appear at the bottom of the app (and sometimes along the top) when you right-click, swipe from the top or bottom, or press Windows key + Z.
From the Start screen, you can kick off a search just by starting to type. Choose a different option from the list below the search box to change the scope of the search.
Metro style apps work well with the search box as long as the app developer enables that capability. In this case, I've sent the search term to the Mail app, where it found a single matching message.