What else is there that companies will buy? Nothing.
Google apps does ok, and Open office has a small following, but office is going to do what it always does. Dominate the applications world.
Oh, and just FYI. Most midsize to large companies buy corporate licenses from MS that allow them to sue whatever version of Office they want, so if your worries about 2010 competing with 2007, don't. Once licenses fits all :)







