If you're referring to the new fonts supplied by MS, they are installed when
you install the software. AFAIK they are not separately available for
download (at least not from a legitimate source) - although I suppose they'd
be included if you d/l the Office 2007 trial software.
If you mean simply additional fonts that you'd like to have, the necessary
instructions are typically included on the sites from which you d/l the
font. See Windows Help for Install/Remove Fonts.
HTH |:>)
Bob Jones
[MVP] Office:Mac