Quick Parts

Tired of repeating yourself over and over again in emails? Make use of Outlook’s “Quick Parts” to store frequently used phrases or paragraphs and you’ll save a bunch of time.
Use the new email window to type out the text you’d like to use frequently, highlight it and from the top menu select Insert > Quick Parts > Save selection to add it to the quick part gallery.

You now have two options: either use Insert > Quick Parts to add the text in, or just start typing it in the new email message window. Outlook will offer a visual indication, and you can simply hit the Enter key to instantly add it to your message.