How to Set the Default Message Format in Outlook
HTML is the default message format in Outlook.
While plain text format works for all email programs, it doesnt support text formatting.
Rich Text Format (RTF) is only supported by Microsoft Exchange Client versions 4.0 and 5.0 and Outlook.
To configure the default format for new emails in Outlook:
Go toFile>Options.
In theOutlook Optionsdialog box, selectMail.