CodeWeaver's Crossover office is proprietary, and is an improved version of WINE.
Wine is open souce, but doesn't run all programs easily. Its kind of a toss up.
I've heard of some programs on sourceforge trying to get linux apps to run on windows well, and I'll try to find some here in a minute.
Also, you could run linux in an emulator on windows if you wanted to run the programs, as I said in a different thread there is Qemu-DSL (http://gulus.usherbrooke.ca/pub/dist...1-embedded.zip
Or some other such program.
Just note however that this is generally the same as trying to run mac apps on windows or windows apps on mac, except a little more futile than that.
I personally advise switching to OpenOffice.Org but if you can't do that, I'd say crossover office is your best bet.