Changing the Outlook Theme Globally
To make global changes to the Outlook 2010 editor, click the "File" tab and then click the "Help" option.
Now, click "Options" under "Tools for Working With Office."
In the "Outlook Options" window, click the "Stationery and Fonts" button under the "Compose messages" section.
When the "Signatures and Stationery" window appears, click the "Theme" button at the top.
Select a theme from the "Theme or Stationery" window. For this tutorial we chose "Quadrant," but you can choose a different one if desired. Use the preview pane to help choose the one you like. After making the selection, click the "OK" button.
Click the "OK" button on the other windows until you return to the main Outlook window.
Now, click the "New E-mail" button to create a new message. The screen elements should match the theme that you selected in "Outlook Options."