How to change the Stationery in Outlook
You can do so using the Mail Format options. Keep in mind that you can always change the stationery for individual messages.
1. On the File tab, click Options:
2. In the Outlook Options dialog box, on the Mail tab, click the Stationery and Fonts... button:
3. In the Signatures and Stationery dialog box, on the Personal Stationary tab, click the Theme... button to choose stationery:
4. Click OK.
When you create a new message, Outlook uses the stationery you selected. For example: