Outlook doesn't have an option to set the width of a message - it uses the full width of the message window and wraps text in the window as needed. If the recipient opens the message in a window 500 pts wide, the message would be indented 200 pts from the right edge. As set in this screenshot, the right margin is approximately 200 pts. Recommended setting: keep the right margin triangle at or very near the right edge of the page (identified by red arrow).
