MS has a much wider product line than you imply. Using Skype perhaps?
True, but many of their products don't make money. MS Office is their cash cow and Windows OS is the field upon which the cash cow grazes.
-- This is very insightful; Mother Teresa doubted the existence of God on a regular basis, but she kept doing her charitable work faithfully until the day she died. It gave her piece of mind; isn't that what we all want?