Earlier quoted context omitted.
Microsoft is the complete opposite of Facebook's "Move fast and break things". And that's a good thing, in a lot of ways. When entire companies (industries?) are dependent on you: slow & steady to get it right is much, much better than moving quickly to integrate the newest technology.
How is Microsoft slow and steady when he just told you they have poor code quality, no docs, etc.
And I more meant that they have to stick with technologies that they know work for two reasons: legacy & reliability. If Microsoft changes something within their legacy code, that could cause absolutely massive problems around the globe. If reliable features in their code breaks, same problem.
[Edited to fix redundant sentence].