Use the Headings menu to create different levels of headings in your document. Using the headings will automatically apply heading tags to your documents. To pull up the Headings menu in Outlook right click in the text of email and select Styles.
You can modify the heading styles to look like you want. You don't have to use the default style.
Use the bullets and numbering menu to create lists in your document with the appropriate formatting.
You can add additional images as bullets by using the Define New Bullet Menu.
You can also add a link using the Link button located on the Insert Menu.
Locate the Accessibility Checker under the Review menu. The Accessibility Checker can help you identify some but not all accessibility issues that exist in your document.