Windows Phone
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An example of a custom Start Screen on Windows Phone 8.1
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| Developer | Microsoft Corporation |
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| Written in | C, C++ |
| OS family | Microsoft Windows |
| Working state | Current |
| Source model | Closed-source |
| Initial release | |
| Latest release | 8.1 Update 2 (8.10.15148.160) / June 2, 2015 |
| Available in | 130 languages |
| Update method | Zune Software (Windows Phone 7), Firmware over the air (Windows Phone 8+) |
| Package manager | Windows Phone Store |
| Platforms | Qualcomm Snapdragon (based on ARMv7) |
| Kernel type | Hybrid (Monolithic in Windows Phone 7) |
| License | Commercial proprietary software |
| Preceded by | Windows Mobile, Zune, Kin |
| Succeeded by | Windows 10 Mobile |
| Official website | Archived official website at the Wayback Machine (archive index) |
Windows Phone (WP) is a discontinued family of mobile operating systems developed by Microsoft for smartphones as the replacement successor to Windows Mobile and Zune. Windows Phone features a new user interface derived from Metro design language. Unlike Windows Mobile, it is primarily aimed at the consumer market rather than the enterprise market. It was first launched in October 2010 with Windows Phone 7.Windows Phone 8.1 is the latest public release of the operating system, released to manufacturing on April 14, 2014.
Windows Phone was replaced by Windows 10 Mobile in 2015; it emphasizes a larger amount of integration and unification with its PC counterpart—including a new, unified application ecosystem, along with an expansion of its scope to include small-screened tablets.
Work on a major Windows Mobile update may have begun as early as 2004 under the codename "Photon", but work moved slowly and the project was ultimately cancelled. In 2008, Microsoft reorganized the Windows Mobile group and started work on a new mobile operating system. The product was to be released in 2009 as Windows Phone, but several delays prompted Microsoft to develop Windows Mobile 6.5 as an interim release.
Windows Phone was developed quickly. One result was that the new OS would not be compatible with Windows Mobile applications. Larry Lieberman, senior product manager for Microsoft's Mobile Developer Experience, told eWeek: "If we'd had more time and resources, we may have been able to do something in terms of backward compatibility." Lieberman said that Microsoft was attempting to look at the mobile phone market in a new way, with the end user in mind as well as the enterprise network.Terry Myerson, corporate VP of Windows Phone engineering, said, "With the move to capacitive touch screens, away from the stylus, and the moves to some of the hardware choices we made for the Windows Phone 7 experience, we had to break application compatibility with Windows Mobile 6.5."
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