With just a swipe of your finger you can delete an email or flag one for follow-up. All it takes is a multi-touch trackpad or magic mouse.
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Open Outlook > Preferences.
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Choose Reading.
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Under Swipe Gestures, set Swipe left and Swipe right for: Delete, Archive, Mark as Read, or Flag.
Turn off swipe gestures
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Open Outlook > Preferences.
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Choose Reading.
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In Swipe left on the message list to, select None.
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In Swipe right on the message list to, select None.