You have to hand it to Microsoft: It may be the only large software company that doesn't seem susceptible to not-invented-here syndrome. It's true that Microsoft historically has been an intensely competitive company, often trying to undermine competing technologies, e.g., with "embrace and extend" strategies. But whenever a competing technology -- whether a language, or a framework, or an application -- gains adopti…
From firsthand experience... Microsoft has quite a bit of NIH syndrome. Still does. They've just gotten better about it in recent years.
But then MS's bureaucracy can grind down even the most well thought out projects (Also getting better, though).