Set message format
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook\options\mail Options
editorpreference enum - HTML
->
131072 - Rich Text
->
196608 - Plain Text
->
65536
Description
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.