Outlook—Applying stationary to a message
Outlook provides you with the ability to customize your outgoing messages with a background and style called stationary. In this tutorial we will apply a stationary to all outgoing messages.

First go to Tools >> Options

Now Choose the Mail Format tab then click the Stationary and Fonts button.

Now choose the Theme Button.

Now select a theme that you like and choose OK on all the next windows until you are back at your inbox.
Now, when you open a new message, you will see your theme applied.

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