Microsoft’s Surface Neo and Surface Duo are scheduled to ship in holiday 2020, meaning that developers have just a few months to port and test their apps.

Over the next few weeks, Microsoft will begin asking developers to start building apps for the dual-screen future, including the Surface Duo Android phone and the Surface Neo PC that will run Windows 10X, the company’s next-generation operating system.
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https://www.pcworld.com/article/3516112/microsoft-brings-in-developers-to-build-its-dual-screen-future-including-windows-10x.html