One cool move on Microsoft's part can be releasing Microsoft's version of Android. The main problem is Google Play Services. But since MS almost has parallel offerings for all Google Services they can create an "API" compatible version of Google Play services. This way users will be able to install all the current Android applications which are available on Play Store. This can convert Android into an Oligopoly inste…
Here's a bit of trivia: Microsoft filed an amicus brief[1] supporting Oracle's position that API's are copyrighted in Oracle v. Google.
Not long after this, coincidentally (or not) that Microsoft canceled project Astoria[2], which implemented Android APIs on Windows 10 Mobile. If they implement Google's API, and Google were to sue, it would be trivial to prove wilful infringement by citing the amicus brief (they knew it is wrong and they did it anyway).
1. http://www.theregister.co.uk/2013/02/20/oracle_and_world_vs_...
2. https://www.windowscentral.com/microsoft-officially-cancels-...