Windows 10 Mobile is an edition of the Windows 10 operating system being developed by Microsoft. This edition of Windows 10 is a mobile operating system that succeeds Windows Phone 8.1 and is designed for smartphones and small tablets under 8 inches in screen size, running on
ARM as well as IA-32 processor architectures.
Windows 10 Mobile aims to provide greater synergy with its counterpart for personal computers, including more extensive synchronization of content, a new "universal" application ecosystem that will be able to port apps developed for Windows 10 on PCs, Android, and iOS to the platform, as well as the capability, on supported hardware, to connect devices to an external display and utilize a "PC-like" interface with mouse and keyboard input support. Windows Phone 8.1 smartphones will be eligible for upgrade to Windows 10 Mobile, pursuant to manufacturer and carrier support.Some features may vary depending on hardware compatibility.
The first Technical Preview for Windows 10 Mobile was made available for download to select Lumia smartphones as of February 12, 2015.
[Additional Lumia devices were supported in subsequent builds. Versions released after Build 10080, released on May 14, 2015, also work on the Windows Phone variant of the HTC One (M8). Although the M8 is currently the only non-Lumia Windows Phone included in the preview program as of build 10149 released on June 24, 2015, Microsoft has assured that future builds will add support for more non-Nokia, non-Microsoft Windows Phones, though not all devices will be included. No release date for the final version has been announced; Joe Belfioreconfirmed that due to how the OS is being developed, it will not be released in parallel with PC editions of the platform.