This will never happen:

MS Trial: A Call for a New Office

WASHINGTON -- An economist testifying against Microsoft on Monday supported a proposal to create a version of Microsoft Office that runs on alternative operating systems such as Linux.

It will never happen because MS knows perfectly well that within its product line, one product leverages off the other. MS Office for Linux could quickly become the fabled "killer app" for Linux, uncutting Windows.

(And, no, you can't count Office for Mac because Mac's really don't compete for Windows major markets, while Linux could easily, since it can install on the same hardware.)