That's not true. At the time, we gave a serious thought of supporting the platform. A quick inspection of Islandwood, however, was enough to convince us otherwise—be it the frameworks that were missing, hilariously bad implementations of those that were there, dubious choices of the ObjC runtime, the fact that only handful of people from Microsoft actually worked on it, etc. It was an immensely embarrassing project, to be honest. Providing a clean–room implementation of such a mature ecosystem is no small task, of course, but what Microsoft presented was just embarrassing.

King has been using Islandwood to port all their iOS coin-eating games to Windows. (It's part of why even when running on a Windows 10 Desktop PC the games lovingly stick to a strange iOS portrait resolution, because while they can be bothered to port them they aren't worried about making them all that great. ;)

We wouldn't have that default "install me" tile for Candy Crush Saga in Windows 10 if it weren't for Islandwood. :P

Hah. Makes sense.