If no font has been specified in the message, Outlook will fall back to 12pt Times New Roman by default. Is there any way that I can change this default font to something different than 12pt Times New Roman? For instance, 10pt Arial? This is of course because Outlook uses Times New Roman as the default font when none is specified. So although the sender thinks that he/she is sending a message in the Arial format, it actually arrives in Times New Roman on my computer. Several mail applications and web mail services do not actually specify a font when composing and sending a message in HTML format.