The Emperor Occasionally Wears Pants
Executive culture at Microsoft is now willing to admit that Windows Phone isn't selling, and that other platforms matter.
Important bits of Microsoft Office are already shipping for Android, and many other teams have a mandate to target Linux directly. Ports for Compilers, .NET Runtime, PowerShell, etc, are all published or announced.
This is perestroika for the true believers inside Microsoft, and a hollow victory for the people in FLOSS communities that fought the good fight for so long.