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There are hundreds of useful applications that have no Linux counterpart.
Decent music composition and production software is only available for Windows and Mac OS. The cream of the crop of disassemblers - IDA Pro - only has a GUI version for Windows. Practically all Microsoft applications are only available for Windows and sometimes Mac OS, and while many have been cloned for Linux, there is no good copy of Outlook, and no IDE matches the power of Visual Studio. And games, of course, both old and new.