Would anyone be able to give insight on why this would be useful? Im curious, sure, but I'm at a loss to think of a use case.
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Applications: Now you can install and configure applications like apache, postquesql, etc. on windows in the same way you do in linux/other unix platforms.
Strategically, this is a big win for Microsoft. Now they can go to their clients that are moving or thinking about moving to Linux and tell them "There's no need to migrate, just install your apps in Windows."