Set message format

This policy setting controls the default message format in Outlook. If you do not configure this policy setting, new e-mail messages in Outlook are formatted as HTML. If you enable this policy setting, you can set the default e-mail format in Outlook to HTML, Rich Text, or plain text. Users can choose a format other than the default when composing messages. If you disable this policy setting, Outlook uses HTML as the default e-mail format and users will not be able to change it. If you do not configure this policy setting, Outlook uses HTML as the default e-mail format, but users can choose a format other than the default when composing messages.