I've just installed Font Awesome as a system font on my Mac (OS X 10.6.8), and it doesn't seem to work in Microsoft Office 2011 (14.2.3). It installs correctly, appears in Font Book, and works as expected in TextEdit, Evernote, and LibreOffice; but in Word or Excel, it doesn't appear in the list of available fonts, and if I past Font Awesome content in from another document, it displays in the default font. I've tried using both the .ttf and .otf versions (uninstalling the first before installing the second), and get exactly the same results.
Any ideas? I was hoping to use some of the icons in a spreadsheet of gaming data.