Five years ago I bought Windows 2000 as a separate program and have used it
with three versions of my OS, never installing Office. Now I'd like to know
if I can update it. MS Support pages don't show a self-standing Word program
that is even available as an upgrade. Windows 2003, it seems, comes bundled
with Office.

Does that mean I'll be obliged to buy Office if I want a later version of
Word than my 2000?