I don't see how MS is getting open source. What makes people say that? Is it the 14 years it took for them to open-source .NET Core, an event that is happening

I don't see how MS is getting open source. What makes people say that? Is it the 14 years it took for them to open-source .NET Core, an event that is happening at a point in time when .NET is most irrelevant? What really pisses me off however is that it's 2015 and Windows 10 and Outlook still don't support CardDAV and CalDAV. They'll get their hand forced by market pressure of course and as usual they'll end up supporting the minimum they can to get away with, which means they'll provide special hooks for Google and probably iCloud. All of this in the context of Edge, yet another buggy and proprietary incarnation of IExplorer in a world in which Chromium and Firefox exist. And of course, we mustn't forget the patents racketeering they are doing at the expense of the open-source projects that compete with them But oh boy did they change. Their PR department is genius though.