AFAIK, there is no policy or reg edit that can change it. FWIW, HTML in
Outlook is quite safe.

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Diane Poremsky [MVP - Outlook]
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wrote in message
ps.com...
I convert all my mail from HTML to plain text, and I want to remove the
"This message was converted to plain text" dialog box in the messages
so that no one can go back to the original HTML. Does anyone know how
to do that with a GPO or registry edit?

- Matt