Hi @Ember Krumwied,
Thank you for posting in this community.Do you want to modify the font format of body part in the hyperlink and bring it to the draft in Outlook?
If it is, this is not possible at all.
As you can see in RFC 2368, this is not possible at all:
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The special hname "body" indicates that the associated hvalue is the body of the message. The "body" hname should contain the content for the first text/plain body part of the message. The mailto URL is primarily intended for generation of short text messages that are actually the content of automatic processing (such as "subscribe" messages for mailing lists), not general MIME bodies.
Mailto can only contain plain text content, and we can't use CSS tags to make the font bold/italics.
Hope this information helps.
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