Since shortly after its introduction in 1989, Microsoft has updated its popular Office suite of software every three years or so. Those updates included revamped interfaces, new Word fonts and Excel formulas, and a raft of fixes for bugs, some noticeable and others gnat-size. Big and small, these updates were wrapped up together in a shiny, redesigned box with a new price tag. Typically they were sold to individuals and companies who had recently invested in new PCs. The formula worked for a long time, and it still does; in 2012 there were l billion Office users worldwide, and the suite of productivity software brought in more than half of the $24 billion in global revenue generated by Microsoft's business division.
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