Yep, it was called Project Astoria. Sadly, MS pulled the plug on it a little while ago. The rumors are that it was cancelled because it actually worked too wel

Yep, it was called Project Astoria. Sadly, MS pulled the plug on it a little while ago. The rumors are that it was cancelled because it actually worked too well. The original expectation was that devs had to do a little bit of work to make the app(s) work on Windows Phone but it was looking like they didn't have as much work as they would they would. This was concerning for MS as they thought that devs wouldn't put much effort into making the app work properly on WP and would just release the same version as Android. Not to mention, there would never be a reason for devs to switch to developing UWP apps, if their Android apps could just be ported without much effort.