If you’re thinking about buying a Microsoft Surface Duo, you’ll need to migrate your data from Windows 10 Mobile to Android.

At last long last, Microsoft’s mobile OS experiment has come to an end. Support for the last version of Windows 10 Mobile dies on December 10.

Windows phones will still work, but the last wave of Windows Mobile devices running the last official supported version of Windows 10 Mobile (version 1709, the Windows 10 Fall Creators Update) won’t receive any more updates or patches for Windows 10 Mobile—features, security, or otherwise. Officially, it will cease to exist.
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https://www.pcworld.com/article/3488865/windows-10-mobile-is-finally-dead-how-to-take-your-data-and-move-on.html