Microsoft realized a bit late that they are losing developers to Mac OS X and Linux systems. Almost all the recent technologies are well supported on these platforms than Windows. For the first anniversary (July 29, 2016) of the Windows 10 release, Microsoft is packing in new features to the Windows 10 operating system. One of the important new feature is an Ubuntu sub-system for the Windows kernel, that would run bash without changes as it would on a Ubuntu system.
This sub-system release is considered a beta and they are still working to fix a number of issues for compatibility and acceptance.