[edandersen]

The reasoning is likely that there is now an internal KPI for open sourcing code because it helps MS PR.

[cwyers]

I doubt that it's anything as ephemeral as "public relations" that's driving this. They want developer mindshare. Having developers writing for .NET means more software available for Windows users and for Azure services. That means more people buy Windows devices and Azure time.

[duaneb]

It's not just PR. Open sourcing brings real benefits—look at the development around LLVM.

Good tooling helps everyone.

[jsprogrammer]

Will no doubt help realize the synergies and strategic alignments that were previously synthesized by Nadella.