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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.
Use this group of settings to remove clutter from the search screen.
Metro style apps can display notifications, such as the number of unread messages, on the lock screen. You can assign up to seven apps to this group, with each such app allowed to run in the background.