One good example is Microsoft adding dtrace to Windows. The Linux community has floundered for years with several competing tracing tools, all of which have major deficiencies in one way or another.

Also from firsthand experience: for many (not most) of MS's projects, that's the right decision. A lot of their software is at a unique intersection between consumer and enterprise support which at their scale often has unique requirements.

But then MS's bureaucracy can grind down even the most well thought out projects (Also getting better, though).