If Mircosoft were to fully collaborate with the Linux/open source community what would the resulting Linux distro chimera look like and how would it affect the Linux community in general?

I am aware of the Linux subsystem and projects like Linspire and ReactOS that attempt to either better compatibility between the two OSs or replicate the other but I was wondering if Microsoft were to open source the entirety of Windows what the ramifications on the Linux community would be....