Excel is still the killer business app. Its functionality and performance is by far the leader of the sector. Until other spreadsheet programs can offer compa

Excel is still the killer business app. Its functionality and performance is by far the leader of the sector. Until other spreadsheet programs can offer comparable functionality and performance, other operating systems don't stand a chance in widespread company use, with the exception of Macs. If any OS has a chance of supplanting Windows in business, it's OSX, and mainly because you can run the latest version of Excel on OSX.