The Astoria project at Microsoft failed because a breakthrough was needed to overcome the complexity of the software development challenge. Microsoft tried to automate mapping the Android UI into the Windows 10 UI and to map Google services within the app such as maps, payments and notifications into Microsoft equivalents. Automated conversion of a UI from one platform to another has never been successfully demonstrated.

When I first saw Microsoft's Android bridge at Build 15, I thought it was achievable. But project Astoria as it is called is much too complex. Drawing on my architectural knowledge of the underlying Microsoft/Lumia hardware that is very similar to Android phones.I concluded that in the context of partitioning the device or running a VM Microsoft would succeed. But Microsoft tried something much more ambitious.