And, even if your machine is OS X only, you can still upgrade. Back up your
M.U.D. Folder, and have it ready. In my case, I had the built in CD ROM to
put the Office update in and then I had my Office:mac 2001 disk in a
separate reader (CDRW External). Even though the Office:mac 2001 wasn't
installed (I have no classic environment at all!), the updater qualified my
CD and allowed me to do some cool import/export things with Apple's Mail and
such. This may or may not apply to you, though. If it does, hope it helps.
Len