For you, it may be becoming irrelevant. But going as an independent consultant MSO really is the only solution in the area that I work. Not only that, but Office Mac is not 100% compatible with Windows and Excel 2011 has been butchered in terms of functionality.Office is becoming irrelevant. The iPad has flourished despite not having MS Office and that's an encouraging sign. The days of Microsoft software being a "must have" for success are over.
Today people just care about having some sort of import/export capability and are comfortable with non Microsoft solutions.
All of which has left e having to buy a goddam Windows computer just to get work.