This option is available as part of the compose new message window. The message format of email message in Outlook 2010 and Outlook 2013 can be changed using the Format Text menu option. Change message format in Outlook 2010 and Outlook 2013 This tutorial is about the steps required to change email format in Outlook. The three email formats provided to the users are HTML, Rich Text and Plain Text.
Microsoft Outlook allows users to receive and send emails in their preferred email format.