Microsoft's Project Astoria, was devised to port Android apps and run them on Windows 10. This is part of the plan to increase the number of apps on the Windows store and improve its app ecosystem. Microsoft had planned to bring several of Android and iOS apps that would easily help to translate the apps from other platforms onto Windows app platform.
However, this plan now seems to have been cancelled. According to a report published, there were problems in this plan and the team responsible for this faced some problems. There are also reports that Microsoft was hit by security issues. Microsoft also wants developers to use its own tools. Microsoft does not just want to port the apps from other platforms onto its own app ecosystem. Under the umbrella is Project Westminster for porting web apps, Project Centenniel that ports over Classic Win32 apps, and Project Islandwood for porting iOS apps. It must be noted that the plan to port apps from Android has been cancelled for now.
An official statement from Microsoft stated, "We're committed to offering developers many options to bring their apps to the Windows Platform, including bridges available now for Web and iOS, and soon Win32. The Astoria bridge is not ready yet, but other tools offer great options for developers. For example, the iOS bridge enables developers to write a native Windows Universal app which calls UWP APIs directly from Objective-C, and to mix and match UWP and iOS concepts such as XAML and UIKit. Developers can write apps that run on all Windows 10 devices and take advantage of native Windows features easily. We're grateful to the feedback from the development community and look forward to supporting them as they develop apps for Windows 10."
The Project Astoria did not materialize and the final version of the Windows 10 mobile lacks all the code from Android emulation. Project Islandwood, as part of porting apps from iOS to Windows app ecosystem still seems to be there and it exists. The initiative to port apps from other mobile platforms onto the Windows platforms was only to improve the Windows app ecosystem. A rich ecosystem of apps on Windows 10 can ensure that customers are attracted well to Windows devices.