Once there was a way to open ODF (Open Document Format, read OpenOffice) docs in MS Office. You could get a free (as in beer) plugin from sun and open files. Not anymore.
Although the Oracle site still, at the time of writing, offers the software for free with the tagline “Get it now: FREE”, users clicking through will find that Oracle are now charging $90, per user, for a right-to-use license for the plug-in and offering support costing $19.80 per user for the first year. Oracle also requires a minimum order of 100 licenses, which means the minimum purchase is $9,000.
P.S. if someone needs the last free version, send me an email or something