Looks like it's changed a lot. It looks like it was good until about 2010, then it stopped working. Might also be why they apparently renamed it to "Crossover" from "Crossover Office." Guess I'm really out of date here. :)
Wait, maybe I was looking at _Mac_ compatibility. It looks like 365 runs decently on Linux.
I'd really love to ditch my windows machine, but my employer makes use of excel plugins that only run on the desktop version.