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You can give an email a customized look by applying a theme. A theme is a set of formatting choices that include a set of theme colors, a set of theme fonts (including heading and body text fonts), and a set of theme effects (including lines and fill effects).
Outlook provides several built-in themes, but you can also create your own theme.
You can change a theme by using built-in combinations of theme colors, fonts, and effects, or customize a theme by creating new combinations of theme colors or fonts. You can save your customizations so that you can use them again and again, saving you time in the long run.
So that you can reuse your theme, you need to save your theme as a theme file. Theme files have their own file format (Office Theme *.thmx), and when you save a theme to the default location, your customized themes appear in the Themes gallery.
After you save your custom theme, you can apply it to either a new or an existing email by opening the Themes gallery and then clicking the thumbnail.
