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Windows Phone 8.1, rolled out at Microsoft's Build Conference in San Francisco, California, on April 2, 2014, is the third generation of Microsoft's Windows Phone mobile operating system, succeeding Windows Phone 8.〔Fourth Generation Talk〕 It was released in final form to Windows Phone developers on April 14, 2014 and reached general availability on July 15, 2014.〔〔(Windows Phone 8.1 – Microsoft quietly sends invites for confidential SDK Dev Preview program | Windows Phone Central )〕〔(Microsoft announces Windows Phone 8.1 with Cortana, coming in April )〕〔(Windows Phone 8.0 is upgradeable, Microsoft says - Computerworld )〕〔(【引用サイトリンク】url=http://www.phonearena.com/news/Are-all-Windows-Phone-8-handsets-upgradeable-to-WP-8.1-Microsoft-exec-seems-to-say-yes_id51264 )〕 All Windows Phones running Windows Phone 8 will be upgraded to Windows Phone 8.1,〔(【引用サイトリンク】 title=All current WP8 devices are eligible for the update. )〕 with release dependent on carrier rollout dates.〔(【引用サイトリンク】 title=Track Windows Phone 8.1+Lumia Cyan rollout here! )〕 Windows Phone 8.1 is also the last version that will be under the Windows Phone brand name and will be succeeded by Windows 10 Mobile. Most Windows Phone 8.1 devices will be capable of being upgraded to Windows 10 Mobile, subject to device compatibility. ==History== Windows Phone 8.1 was first rumored to be ''Windows Phone Blue'', a series of updates to Microsoft's mobile operating system that would coincide with the release of Windows 8.1. Although Microsoft had originally planned to release WP8.1 in late 2013, shortly after the release of its PC counterpart,〔(Microsoft says 'next release' of Windows Phone is on target for the holidays | The Verge )〕 general distribution of the new operating system was pushed back until early 2014.〔(Microsoft details new Windows Phone 8 update, but real fixes won't come until 2014 | The Verge )〕 Instead of waiting over a year to add new features to Windows Phone 8, Microsoft opted to release three incremental updates to its existing mobile OS. These updates are delivered with corresponding firmware updates for the specific devices. The updates included GDR2 (Lumia Amber), which introduced features such as "Data Sense",〔(Complete Guide to Windows Phone 8 GDR2 | Windows Phone content from Paul Thurrott's SuperSite for Windows )〕 and GDR3 (Lumia Black), which brought support for quad-core processors, 1080p high-definition screens of up to six inches, the addition of a "Driving Mode," and extra rows of live tiles for larger "phablet" devices.〔(Microsoft Windows Phone 8 GDR3 update detailed | Pocketnow )〕 The updated operating system's final name was leaked to the public when Microsoft released the Windows Phone 8.1 SDK to developers on February 10, 2014,〔 but it wasn't until Microsoft's Build conference keynote on April 2, 2014 when Windows Phone 8.1 was officially announced, alongside the Windows 8.1 Update. The final shipping code was released to registered users of the "Preview for Developers" program on April 14, 2014,〔(【引用サイトリンク】 title=Windows Phone 8.1 now available to developers )〕 and to the general public in subsequent months, the actual release date being determined by the devices' wireless carriers and accompanied with firmware updates, including Lumia Cyan. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Windows Phone 8.1」の詳細全文を読む スポンサード リンク
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