Reply format

[Jules]

My default mail format is in HTML, but when I reply to another email it get
sent in the format in which it was sent to me. Can I default my reply to all
messages as HTML?

 

[Brian Tillman]

My default mail format is in HTML, but when I reply to another email
it get sent in the format in which it was sent to me. Can I default
my reply to all messages as HTML?

No. Outlook will always reply using the format of the original message.
Why would you want to use a format that your recipient may not be able to
read?