Unity CEO David Helgason has said that his company's game engine will never find its way onto Windows Phone 7 - because of the closed nature of the system.
Speaking to Develop, Helgason explained that any app or program which runs on the platform must be developed in either XNA or a bespoke version of Microsoft's Silverlight, which would be possible for Unity, but require too much work to be worthwhile.
Describing the platform as: "a relatively closed system so you can't run native content, which means we can't really support it," Helagson went on to say that, "we're looking at Windows Phone 8 and hopefully it will be easier to work on that system."
Unity powers thousands of both Android and iOS apps, as well as being a prominent engine for browser-based titles. Unity is also used for some titles on the three console platforms and has been licensed for the PlayStation Vita.