This is happening one only one of my two Macs. In Outlook 2011 I can change the font to be used for composing HTML messages under the "Fonts" preference, but on the other Mac any change to the font (from Calibri) is ignored - come back to the screen and it's back at Calibri. Size changes work, just not the change to the font. Does anyone have any suggestions? FontBook has been checked for invalid fonts, permissions checked on the disc. Something seems to be stopping Outlook from changing the font.