On a touch-enabled device, you can draw with your finger, a digital pen, or a mouse.
Available inking features depend on the type of device you're using.
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              First, tap the body of the email message. 
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              Tap Draw > Drawing Canvas - 
              On the Draw tab, tap a pen once to select it. 
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              Tap again to open the menu of Thickness, Color, and Effect options and select your preferences. 
 
                         
				 
				