Arabic Fonts Office 2003

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So my brother asked me an interesting question yesterday. His girlfriend needed a specific font (Britannica Bold) for an assignment, and after some research my brother determined that the font is included with Office 2003 Professional -- which he had coincidentally recently bought.
Only thing is, Britannica Bold isn't on his system. Neither are a lot of the other fonts listed here. He called me, and I checked my home PC (likewise -- Office 2003 Pro). Same deal. I came into work today and looked (again, Office 2003) -- and voila, Britannica Bold is installed.
Missile ya waumini pdf editor. The same list of apps is installed both places (i.e. I didn't leave out Publisher at home, or anything). Why does my office PC have the font, but my home PC doesn't?
That page says

This collection contains 14 free Arabic fonts. OS: 7 / NT / XP / 2003 / Vista. Popularity: 100%. Support URL: No longer supported. Tagged with: font fonts typography arabic font pack. Fonts are great for creating posters, beautiful letters, for headlines or just for fun. You can also try the free California Fonts.

Note: The installation of any particular font may be dependent on the installation options that are selected.

Arabic fonts office 2003 freeWhat installation options other than application selection (i.e. including Word or not) change which fonts are installed? Anyone know?