Yup. Android is still far more open than Windows Phone/mobile from that point of view, which is why it's possible for Microsoft to do many of these things with Android. Last I checked you couldn't even have another browser other than IE on Windows Phone, and I assume that won't change with Windows 10 mobile.

Also you can make Android apps work on Windows or another OS relatively easy but the reverse isn't true (not counting the very hacky WINE on Linux).

All of that still shows that at least for now Google is still much more "open" than Microsoft is.

The unfortunate thing is that these moves where Microsofts gets to integrate with "open" stuff from Google, and then gets all credit for doing that, is only going to force Google to become more closed to stop Microsoft from doing that. It's kind of a nash equilibrium.

When you open up a lot of stuff and your competitor uses it freely and gets credit for doing that, but you can't do the same with your competitors' products - what's the outcome?

It reminds me of when Gtalk was open right until Microsoft wanted to integrate it with Skype. Then Google shut down that API because it couldn't have done the same with Skype, and Microsoft would've been the one with the app that has "both Skype and Gtalk", and not Google.