Windows 10 Mobile

Windows 10 Mobile

300px Screenshot of Windows 10 Mobile home screen
Developer	Microsoft
Written in	{{#property:p277}}
Released to manufacturing	November 20, 2015 (2015-11-20)
Latest release	10.0.10586.318 / May 10, 2016 (2016-05-10)
Latest preview	10.0.14342.1004 / May 25, 2016 (2016-05-25)
Update method	Windows Update
Platforms	32-bit ARMv8, ARMv7, IA-32
Kernel type	Hybrid (Windows NT)
License	{{#property:p275}}
Preceded by	Windows Phone 8.1 (2014)
Official website	{{#property:P856}}
Support status
Mainstream support until January 9, 2018. Devices need to install the latest update to remain supported and be within the OEM support period.

Windows 10 Mobile is a mobile operating system developed by Microsoft. It is an iteration of the Windows Phone product line and a successor to Windows Phone 8.1, but is marketed as being an edition of Windows 10, Microsoft's operating system for personal computers, as part of Microsoft's plans to unify Windows' application platform across multiple device classes.

Windows 10 Mobile aims to provide greater consistency with its counterpart for personal computers, including more extensive synchronization of content, a new universal application platform that allows one app to run on multiple Windows 10 devices such as PCs, mobile devices and Xbox, as well as the capability, on supported hardware, to connect devices to an external display and use a "PC-like" interface with mouse and keyboard input support. Microsoft has built tools for developers to easily port some iOS apps with minimal modifications. Windows Phone 8.1 smartphones are eligible for upgrade to Windows 10 Mobile, pursuant to manufacturer and carrier support. Some features may vary depending on hardware compatibility.

Windows 10 Mobile is designed for use on smartphones and phablets, running on ARM as well as IA-32 processor architectures. Windows 10 Mobile entered public beta for selected Lumia brand smartphones on February 12, 2015. The first Lumia smartphones powered by Windows 10 Mobile were released on November 20, 2015 while eligible Windows Phone devices began receiving updates to Windows 10 Mobile on March 17, 2016, pursuant to manufacturer and carrier support.

Development

Microsoft had already begun the process of unifying the Windows platform across device classes in 2012; Windows Phone 8 dropped the Windows CE-based architecture of its predecessor, Windows Phone 7, for a platform built upon the NT kernel that shared much of the same architecture with its PC counterpart Windows 8 including file system (NTFS), networking stack, security elements, graphics engine (DirectX), device driver framework and hardware abstraction layer. At Build 2014, Microsoft also unveiled the concept of "universal" Windows apps. With the addition of Windows Runtime support to these platforms, apps created for Windows 8.1 could now be ported to Windows Phone 8.1 and Xbox One while sharing a common codebase with their PC counterparts. User data and licenses for an app could also be shared between multiple platforms.

In July 2014, Microsoft's then-new CEO Satya Nadella explained that the company was planning to "streamline the next version of Windows from three operating systems into one single converged operating system for screens of all sizes," unifying Windows, Windows Phone, and Windows Embedded around a common architecture and a unified application ecosystem. However, Nadella stated that these internal changes would not have any effect on how the operating systems are marketed and sold.

On September 30, 2014, Microsoft unveiled Windows 10; Terry Myerson explained that Windows 10 would be Microsoft's "most comprehensive platform ever," promoting plans to provide a "unified" platform for desktop computers, laptops, tablets, smartphones, and all-in-one devices. Windows 10 on phones was publicly unveiled during the Windows 10: The Next Chapter press event on January 21, 2015; unlike previous Windows Phone versions, it would also expand the platform's focus to small, ARM-based tablets. Microsoft's previous attempt at an operating system for ARM-based tablets, Windows RT (which was based upon the PC version of Windows 8) was commercially unsuccessful.

During the 2015 Build keynote, Microsoft announced the middleware toolkit "Islandwood", later known as Windows Bridge for iOS, which provides a toolchain that can assist developers in porting objective-C software (primarily iOS projects) to build as Universal Windows Apps. An early build of Windows Bridge for iOS was released as open source software under the MIT License on August 6, 2015. Visual Studio 2015 can also convert Xcode projects into Visual Studio projects. Microsoft also announced plans for a toolkit codenamed "Centennial", which would allow desktop Windows software using Win32 APIs to be ported to Windows 10 Mobile.

At Build, Microsoft had also announced an Android runtime environment for Windows 10 Mobile known as "Astoria", which would allow Android apps to run in an emulated environment with minimal changes, and have access to Microsoft platform APIs such as Bing Maps and Xbox Live as nearly drop-in replacements for equivalent Google Mobile Services. Google Mobile Services and certain core APIs would not be available, and apps with "deep integration into background tasks" were said to poorly support the environment. On February 25, 2016, after having delayed it in November 2015, Microsoft announced that "Astoria" would be shelved. The company argued that it was redundant to the iOS toolkit (which assists in compiling apps natively, and does not use emulation) because of the platform's prominence in multi-platform mobile development, and encouraged use of products from Xamarin (which Microsoft had acquired the previous day) for multi-platform app development using C# programming language instead.

Naming

In accordance with Microsoft's branding strategy, this operating system will be branded primarily as an edition of Windows 10, rather than "Windows Phone 10". Microsoft had begun to phase out specific references to the Windows Phone brand in its advertising in mid-2014, but critics have still considered the operating system to be an iteration and continuation of Windows Phone due to its lineage and similar overall functionality. Microsoft referred to the OS as "Windows 10 for phones and small tablets" during its unveiling, leaked screenshots from a Technical Preview build identified the operating system as "Windows 10 Mobile" and the technical preview was officially called the "Windows 10 Technical Preview for phones". Internally, the Microsoft Edge user agent on Windows 10 Mobile still contains a reference to "Windows Phone 10".

On May 13, 2015, Microsoft officially confirmed the platform would be known as Windows 10 Mobile.

Features

A major aspect of Windows 10 Mobile is a focus on harmonizing user experiences and functionality between different classes of devices—specifically, devices running the PC-oriented version of Windows 10. Under the Universal Windows Platform concept, Windows Runtime apps for Windows 10 on PC can be ported to other platforms in the Windows 10 family with nearly the same codebase, but with adaptations for specific device classes. Windows 10 Mobile also shares user interface elements with its PC counterpart, such as the updated Action Center and settings menu. During its initial unveiling, Microsoft presented several examples of Windows apps that would have similar functionality and user interfaces between Windows 10 on desktops and mobile devices, including updated Photos and Maps apps, and new Microsoft Office apps. Although marketed as a converged platform, and as with Windows Phone 8, using a Windows NT-based kernel, Windows 10 Mobile still cannot run Win32 desktop applications, but is compatible with software designed for Windows Phone 8.

Notifications can be synced between devices; dismissing a notification on, for example, a laptop, will also dismiss it from a phone. Certain types of notifications now allow inline replies. The start screen now has the option to display wallpapers as a background of the screen behind translucent tiles, rather than within the tiles. The messaging app adds support for internet-based Skype messaging alongside SMS, similarly to iMessage, and can synchronize these conversations with other devices. The camera app has been updated to match the "Lumia Camera" app previously exclusive to Lumia products, and a new Photos app aggregates content from local storage and OneDrive, and can perform automatic enhancements to photos. The on-screen keyboard now contains a virtual pointing stick for manipulating the text editing cursor, a dedicated voice input button, and can be shifted towards the left or right of the screen to improve one-handed usability on larger devices.

Windows 10 Mobile supports "Continuum", a feature that allows supported devices to connect to an external display, and scale its user interface and apps into a "PC-like" desktop interface with support for mouse and keyboard input over USB or Bluetooth. Devices can connect directly to external displays wirelessly using Miracast, via USB Type-C, or via docking station accessories with USB ports, as well as HDMI and DisplayPort outputs.

A new iteration of the Office Mobile suite, Office for Windows 10, is also bundled. Based upon the Android and iOS versions of Office Mobile, they introduce a new user interface with a variation of the ribbon toolbar used by the desktop version, and a new mobile version of Outlook. Outlook utilizes the same rendering engine as the Windows desktop version of Microsoft Word. Microsoft Edge replaces Internet Explorer Mobile as the default web browser.

Release

Windows 10 Mobile's first-party launch devices—the Lumia 950, Lumia 950 XL, and Lumia 550—were released in November 2015. Monthly updates to OS software will be released to address bugs and security issues. These updates will be distributed to all Windows 10 Mobile devices and not require the intervention of a user's wireless carrier in order to authorize their distribution. Firmware upgrades will still require authorization by the user's carrier.

The Windows Insider program, adopted to provide a public beta for the PC version of Windows 10, is used to provide a public beta version of Windows 10 Mobile for selected devices. A build released on April 10, 2015 was to support most second and third generation Lumia products, but the Lumia 930, Lumia Icon, and Lumia 640 XL did not receive the update due to scaling bugs, and delivery was suspended as a whole due to backup and restore issues on some models. An update to the Windows Phone Recovery Tool resolved these concerns, and delivery of Windows 10 updates was restored to the 520 with build 10052, and to the 640 with build 10080.

Build number 10136 was released on June 16, 2015, with a "migration bug" that required that existing devices on build 10080 be reverted to Windows Phone 8.1 using the Recovery Tool before the installation of 10136 could proceed. This migration bug was fixed a week later with the release of build 10149. Mobile builds of the Redstone branch till 14322 were halted for the device Lumia 635 (1 GB RAM) due to bugs.

Upgrade release

Some Windows Phone 8.1 smartphones can be upgraded to Windows 10, pursuant to hardware compatibility, manufacturer support, and carrier support. Not all phones can receive the update nor support all of its features. Microsoft originally stated that stable upgrades for Windows Phone 8.1 devices would be released in December 2015; however, the release was ultimately delayed to March 17, 2016. Among first-party devices, only the Lumia 430, 435, 532, 535, 540, 635 (1 GB RAM), 640, 640 XL, 735, 830, 930 and 1520 are supported. The only third-party devices supported are the BLU Products Win HD w510u and Win HD LTE x150q, and the MCJ Madosma Q501. Windows 10 Mobile is not supported by any HTC devices (HTC Windows Phone 8X, HTC One (M8) for Windows). While Microsoft stated that the Nokia Lumia Icon may be upgraded at a later date, the company stated that there will not be a second wave of officially-supported devices. Microsoft also removed statements which promoted the BLU Win JR LTE as being compatible with Windows 10.

Microsoft originally stated that all Lumia smartphones running Windows Phone 8 and 8.1 would receive updates to 10, but Microsoft later reiterated that only devices with the "Lumia Denim" firmware revision and at least 8 GB of internal storage would receive the upgrade. In February 2015, Joe Belfiore stated that Microsoft was working on support for devices with 512 MB of RAM, (such as the popular Nokia Lumia 520), but these plans have since been dropped. Upon the official upgrade release, some Lumia models, particularly the Lumia 1020 and 1320, were excluded despite meeting the previously announced criteria. Microsoft cited poor user feedback on the performance of preview builds on these models as reasoning.

Devices

See also: List of Windows 10 Mobile devices

As with Windows Phone, Windows 10 Mobile supports ARM system-on-chips from Qualcomm's Snapdragon line. The operating system will also introduce support for IA-32 system-on-chips from Intel and AMD, including Intel's Atom x3 and Cherry Trail Atom x5 and x7, and AMD's Carrizo. Although some of these supported chips are 64-bit, Windows 10 Mobile only supports 32-bit operation.

Minimum specifications for Windows 10 Mobile devices are similar to those of Windows Phone 8, with a minimum screen resolution of 800×480 (854×480 if software buttons are in use), 1 GB of RAM and 8 GB of internal storage. Owing to hardware advancements and the operating system's support for tablets, screen resolutions can now reach as high as QSXGA resolution (2560×2048) and further, as opposed to the 1080p cap of Windows Phone 8. The minimum amount of RAM required is dictated by the screen's resolution; screens with a resolution 1440×900 and higher require 2 GB, 2048×1152 and higher require 3 GB, and 2560×2048 and higher require 4 GB.

Microsoft unveiled flagship Microsoft Lumia smartphones during a media event on October 6, 2015, including Lumia 950, Lumia 950 XL, and the low-end Lumia 550.

Version history

See also: Windows Phone version history and Windows 10 version history

Legend:

Old version

Older version, still supported

Latest version

Latest preview version

Future release

Codename "Threshold 1"

Microsoft announced Windows 10 Mobile on their January 21, 2015 event "The Next Chapter". The first Windows 10 Mobile was rolled out on February 12, 2015 as part of the Windows Insider Program to a subset of mobile devices running Windows Phone 8 and 8.1. The development never reached RTM stage and so Microsoft skipped a public release of this branch of the OS and moved all devices to Version 1511.

Pre-release versions of Windows 10 Mobile codename "Threshold 1"
Version number	Release date	Notes
Old version, no longer supported: 9941.12498	Fast ring: February 12, 2015 Slow ring: February 12, 2015	User interface Home screen wallpaper displayed behind translucent tiles rather than within them Live tiles can be tall in size Updated design for context menus General user experience Ability to expand notifications Actionable notifications Action Center with additional settings toggles and same design across Windows 10 devices App list redesigned with wallpaper as background, recent installed apps at top and ability to search for apps Keyboard contains virtual pointing stick for text selection and a voice input button Notifications can be synchronized between other Windows 10 devices Press and hold on any toggle in Action Center takes you to respective settings of that option Reminder of coming calendar events when turning the device off Security features Device encryption option Apps New file explorer app Rendering engine developed in Microsoft Edge hosted in Internet Explorer Standard camera app changed to match functionality and appearance of Lumia Camera app "Universal" apps Alarms app, adding world clock, timer, and stopwatch modes Calculator app with a built in unit converter Photos app with OneDrive synchronization, collections and automatic photo enhancements Settings app with the same categorization and layout on Windows 10 devices Sound recording app added
Old version, no longer supported: 10.0.12534.56 (Build 10051)	Fast ring: April 10, 2015	General user experience Keyboard can be made smaller and shifted to the left or right of the screen for one-handed use on large-screen devices LED notification support for individual apps Pen and inking support Possibility for speech input in virtually any data field one can type. Possibility to delete the primary Microsoft account without resetting the device Possibility to set battery saver threshold anywhere from 60% to 5% battery Smart dialing Updated app switcher that moves from left to right, up to 15 recently used apps and new grid layout for large-screen devices Security features App permissions for location Windows apps Maps app with Here Maps data, Cortana integration, turn-by-turn navigation Music app with OneDrive syncing of music and playlists Outlook mail and Outlook calendar People app which aggregates people across social networks and is synced with Windows 10 devices Phone and Messaging apps A new web browser app (codenamed "Project Spartan")
Old version, no longer supported: 10.0.12534.59 (Build 10052)	Fast ring: April 21, 2015	Bug fixes Camera's viewfinder application Disable data connections Downloading keyboards in additional languages Entering the correct PIN code would freeze some phones Flight mode MMS settings being lost while installing the preview
Old version, no longer supported: 10.0.12562.84 (Build 10080)	Fast ring: May 14, 2015	User interface New accent colors New live tile animation Setting for background transparency Transparent tiles with background within as in Windows Phone 8.1 General user experience Change keyboard language by swiping space bar Long press on QWERTZUIOP letters for number access New technology support Mouse pointing devices Windows apps Getting started app Office for Windows 10, including Excel, OneNote, PowerPoint, and Word Preview Music Preview Video Windows Store beta Xbox App
Old version, no longer supported: 10.0.12634.131 (Build 10136)	Fast ring: June 16, 2015	User interface All apps letter 'jump' buttons are ALL CAPS instead of lower case Many UI refinements Split-view settings in landscape mode on higher-res displays General user experience 3G only setting for highest connection speed Cortana improvements Reachability feature for 5" devices and above, press and hold Windows button for screen to slide down Search box replacing the search button at the top of the all apps list Battery Saver now displays detailed information on an application's battery usage concerning lighting up the screen, running the processor or transferring data The ability enable and disable OneDrive backups for individual applications. "Project Spartan" (in later betas, and released Windows 10, branded as Microsoft Edge) Internet Explorer Mobile – removed InPrivate mode Secure sites – marked with a badge Full-screen videos A "Save as" option for web images to convert files into .png or .jpg images New technology support VPN Point to Point Tunnelling Protocol (PPTP) and Secure Socket Tunnelling Protocol (SSTP) Digital video stabilization
Old version, no longer supported: 10.0.12648.133 (Build 10149)	Fast ring: June 25, 2015 Slow ring: July 8, 2015	User interface Updated icons and visuals (including visual controls) General user experience Flashlight toggle in notification center Quiet hours enabled from Cortana's notebook Option for showing notification panes on the lockscreen Download limit on 3G networks removed Windows apps "Project Spartan" branded as Microsoft Edge Microsoft Edge gained option to view a website as "desktop" or "mobile" Microsoft Edge's address bar moved to bottom of the screen Automatic camera roll back up is now enabled from the OneDrive application Photos now supports .gif files Photos now shows albums (Camera roll, screenshots, saved photos) New technology support The built-in camera application now supports Face detection HTTP Live Streaming
Old version, no longer supported: 10.0.10166.0	Fast ring: July 10, 2015 Slow ring: July 22, 2015	General user experience Removal of the Windows Phone Store "Universal" Windows Store is out of beta Battery icon in Action Center is now larger Security Users who forgot their PIN are now prompted to enter "A1B2C3" as opposed to being locked out of their mobile telephones requiring a hard reset Ability to change PIN with Microsoft accounts after 5 failed attempts Bug fixes Compatibility for apps has been improved Improved reliability of app downloads and updates from the Store Missing migration screen post-reboot when updating has been re-implemented

Codename "Threshold 2"

Microsoft switched the channel of all builds from 10512 to Threshold 2 as Threshold 1 could not reach RTM stage in time. The release was officially dubbed "Version 1511" or "November Update". Windows 10 Mobile launched with the Microsoft Lumia 550, 950 and 950 XL. The rollout for Windows Phone 8.1 devices started March 17, 2016.

Pre-release versions of Windows 10 Mobile codename "Threshold 2"
Version	Release date	Notes
Old version, no longer supported: 10.0.10512.1000	Fast ring: August 12, 2015	General user experience Users can now set the Lock screen and background image from within the Photos app Improvements to the Kid's Corner tile layout Improved reliability of Data Sense notifications Bug fixes General improvement in overall stability and performance Fixed an issue where apps installed on SD cards weren't working after a reboot Improved Latvian and Chinese inputs Modified Shape Writing algorithm to be less aggressive in suggesting contact names over common words Resolved an issue where Camera would not launch when the phone was locked Fixed an issue where notifications for incoming text messages weren't appearing Fixed an issue where the touch screen wouldn't be responsive after ending a phone call on some devices Fixed an issue where folder tiles have obviously overlapping text Over 2,000 other bug fixes
Old version, no longer supported: 10.0.10536.1004	Fast ring: September 14, 2015	General user experience One-handed mode for all phones Added Japanese and English (India) speech recognition for Voice input Bug fixes Loading loop of start screen fixed Lock screen delay of date and time fixed Mobile hotspot functionality restored Pinch and zoom in Maps app Quiet Hours fixed Single update from Windows Phone 8.1 to Windows 10 Mobile Insider Preview for all devices Two-factor authentication is fixed when setting up a device for both text and phone authentication
Old version, no longer supported: 10.0.10549.4	Fast ring: October 14, 2015	General user experience Cortana enabled for Japan and English speakers in Australia and Canada Diverse Emoji characters Lumia Camera is now enabled for Nokia Lumia 1020 devices Option of vibration when an outgoing call is answered Text box in the Messaging application can now be expanded New technology support USB On-The-Go Windows Hello
Old version, no longer supported: 10.0.10572.0	Fast ring: October 20, 2015	General user experience Cortana can now order automobiles via the Uber service Email accounts are now placed under general account settings Support for sending SMS from a Windows 10 PC logged in to same Microsoft Account Support for notification of missed calls on a Windows 10 PC logged in to same Microsoft account The transparency slider for live tiles now controls more than just opacity VPN quick setting removed from the Action Centre Skype integration for the Microsoft Messaging and Microsoft Phone apps. Conversations and contacts can be synced with Cortana on a Windows 10 PC Support added for Indian English in the Cortana service Block and filter calls and texts User interface The introductory text no longer states "Windows Phone" or "Windows 10 Mobile" but instead "Windows 10" Apps Bing Maps now supports offline maps stored on an SD card Messaging app supports .gif pictures, provides search functionality in messages and lets users toggle message synchronisation across devices Phone app can search contacts displayed in the call history, and shows how many rings a missed caller has waited
Old version, no longer supported: 10.0.10581.0	Fast ring: October 29, 2015	Bug fixes Dual-SIM issues in build 10572 fixed Fixed bugs that affected battery life Fixed issue in Build 10572 where the Chinese Pinyin QWERTY keyboard stopped working after upgrading from Windows Phone 8.1 Fixed issue where user couldn’t choose some apps to show quick status on the Lock screen Hey Cortana functionality restored for some devices that upgraded from Windows Phone 8.1 Improvements to text prediction and auto-correction Possible to select photos for sharing through third party apps Video recording functionality has been improved Visual Voicemail sync should now work properly

Versions of Windows 10 Mobile version 1511 codename "Threshold 2"
Version number	Release date	Notes
Older version, yet still supported: 10.0.10586.0	Public release: November 8, 2015	1st general availability build General user experience First build to run on a phone with support for Continuum First build to run on a phone with support for Windows Hello
Older version, yet still supported: 10.0.10586.11	Fast ring: November 18, 2015 Slow ring: November 20, 2015	Bug fixes Start experience corruption fixed after upgrading and restoring previous backups in build 10581 Default save locations in settings restored Apps in SD card crashes compatibility improved Improvements to Messaging + Skype app Apps and games download more reliably
Older version, yet still supported: 10.0.10586.29	Fast ring: December 4, 2015 Slow ring: December 4, 2015 Public release: December 8, 2015	Bug fixes Additional improvements in upgrade experience, including devices with limited free space, map rendering on update, and RCS enabled device settings. Improved application backwards compatibility for Windows Phone 8.1 Silverlight applications. Edge performance and stability has been improved. Auto-completion has been updated to allow user to more easily edit the end of the URL in the address bar. Additional Bluetooth stability improvements. Resolved issues on switching the active cellular connectivity profile on Dual SIM devices. Data profiles are now correctly restored in the out of box experience that would prevent some devices from sending or receiving MMS messages.
Older version, yet still supported: 10.0.10586.36	Fast ring: December 17, 2015 Slow ring: December 17, 2015	Bug fixes Some minor and general fixes Improved upgrade experience from Windows Phone 8.1
Older version, yet still supported: 10.0.10586.63	Fast ring: January 8, 2016	Bug fixes Some minor and general fixes Improved typing experience on Polish keyboard in Outlook Mail Fixes for turn by turn directions over Bluetooth in car Improved battery usage with Iris Recognition Improved reliability of quick actions settings page Fixes for Microsoft Band use with Cortana on the phone Bugs Message synchronization function causes high bandwidth usage.
Older version, yet still supported: 10.0.10586.71	Fast ring: February 1, 2016 Slow ring: February 4, 2016	Bug fixes Performance and reliability improvements to Windows Update Improvements to the migration of data profiles and messaging settings when upgrading from Windows Phone 8.1 SensorCore API’s are now upgraded correctly from Windows Phone 8.1 Detection of SD cards on boot and after insertion has been improved File Explorer now handles the removal of an SD card when the default for apps or photos are set to SD Improvements to PDF Rendering with Microsoft Edge Improvements for Bluetooth when reconnecting already paired devices and cars Improvements for turn by turn directions when using Cortana and with the Microsoft Band Improvements to Settings when downloading offline Maps, and when changing Quick Settings Fixes for DRM music playback issues when reinstalling Groove Music from the Windows Store Local song collections are now imported into Groove Music more quickly Device power improvements after listening to music, after missed phone calls when iris detection is disabled, and when downloading updates In app purchases now work correctly when cellular data is disabled Reliability improvements to Kids Corner
Older version, yet still supported: 10.0.10586.107	Fast ring: February 10, 2016 Slow ring: February 11, 2016 Release Preview: February 11, 2016 Public Release: February 17, 2016 Upgrade Release: March 17, 2016	Upgrade build for eligible Windows Phone 8.1 devices. Bug fixes Fixes missing tiles after going through the out of box experience Improves support for Narrator in multiple languages Improved reset experience when BitLocker and/or Device Encryption is used
Older version, yet still supported: 10.0.10586.122	Slow ring: March 2, 2016 Release Preview: March 2, 2016	Bug fixes Improvements to Kanji input when using Continuum Thumbnails for portrait videos should now appear more quickly Improvements to Internet Sharing on some network configurations Fixed an issue where Word Flow would not function properly on some sites in Microsoft Edge Fixed an issue with Microsoft Edge that prevented the "close all tabs" option from closing all open tabs Improvements to IMS Registration on some networks Fixed an issue with the OOBE that caused adding an Microsoft account to fail and prevent the account from being re-added after the failure Improvements to email sync experiences when connecting to Wi-Fi networks with a captive portal Improvements to data collection profiles on dual SIM devices Updated background processing of multiple changes to improve battery life Improvements to the quality of video record to SD cards Improvements to audio in video recording for some scenarios Reliability improvements for the OS, the Start screen, app updates, and Windows Feedback app Improvements to alarm reliability
Older version, yet still supported: 10.0.10586.164	Slow ring: March 8, 2016 Release Preview: March 8, 2016 Public Release: March 8, 2016	Bug fixes Reliability improvements for app notifications Data and battery usage improvements for text message backup Fixed an issue where Microsoft account was not detected by Outlook Mail, Outlook Calendar, and People apps, causing People app to crash Fixed an issue where Wi-Fi connectivity would be temporarily switched off after prolonged use Fixed an issue where first-party apps would not install successfully for some users Improvements to battery, Bluetooth connectivity, and OS reliability
Older version, yet still supported: 10.0.10586.218	Release Preview: April 12, 2016 Public Release: April 12, 2016	Bug fixes Reliability, performance and stability improvements. Support for Visual Voicemail on Dual SIM phones. Improvements for Bluetooth connectivity, including the reliability of connecting to and staying connected with Bluetooth devices. Fix for a problem that caused audio playback to get occasionally interrupted in Groove Music and other music apps when phone display was turned off. Improvements for Microsoft Edge browser, including support for configuring a prompt before a file download occurs, support for background downloads, and a fix for a problem where opening a link from an another app wouldn’t load the web page. Reliability improvements for Cortana reading text messages aloud and usability improvements for Quiet Hours feature. Improvements for Store reliability, including a fix for a problem that prevented some apps from being updated and installed. Fix for a problem that occasionally caused some apps to show blank tiles after upgrading from Windows Phone 8.1. Improvements for PC connectivity via USB on some phones that were upgraded from Windows Phone 8.1.
Older version, yet still supported: 10.0.10586.242	Release Preview: April 27, 2016	Bug fixes General user experience Improvements to general application compatibility Improvements in the upgrade experience Improvements to the reliability of reminders Updated "Data Usage" page of Settings Updated Daylight Savings settings Bug Fixes Fixed issues with the navigation bar Fixed issues with SD cards being not detected
Current stable version: 10.0.10586.318	Release Preview: May 10, 2016 Public Release: May 10, 2016	General user experience Improvements to reliability, performance and stability Bug fixes Fixed a problem that resulted in battery drain while the screen is off Fixed bugs related to the update system Fixed a bug that caused devices to finish the initial setup incorrectly Fixes and improvements to Cortana Fixed a bug where music playback would not resume after dismissing an incoming text Fixed bugs with Microsoft Edge browser Fixed a bug that caused recorded video to be lost The navigation bar to no longer overlays and hide parts of the screen like it did before in some cases
Latest preview version of a future release: 10.0.10586.338	Release Preview: June 1, 2016	Improvements to reliability, performance and stability

Codename "Redstone 1"

On February 19, 2016, Microsoft restarted the rollout of full builds for the first feature update codenamed Redstone 1. Like the start of the previous wave, the first builds were not available to all devices that were included in the Windows Insider Program.

Pre-release versions of Windows 10 Mobile codename "Redstone"
Version	Release date	Notes
Older version, yet still supported: 10.0.14267.1002	Fast ring: February 19, 2016	General user experience Music search button is now accessible from Cortana's main screen Word Flow now works in the address bar of Edge Added a button to open an InPrivate tab in the tab view of Edge Added a menu item to close only InPrivate tabs Added a download manager to Edge and improved prompts to save or cancel downloads The ability to attach photos, videos, location, contact, voice note, or ringtone to Skype messages in the Messaging + Skype app Skype "Mojis" added to Messaging + Skype app Bug fixes Fixed an issue where shape writing would ignore every second word when typing into a text box on a website in Microsoft Edge. After installing the Polish keyboard, typing a word that should be accented now offers the recommended accented word. Resolved an issue where you could not hide the navigation bar in Windows Phone 8.1 apps. Fixed an issue where videos recorded onto SD memory cards would result in a large number of dropped frames. Improved app launch reliability and certain crashes that were causing the phone to reboot are also fixed. More polished the Live tile animations and improved logic for refreshing Live tiles. Reliability improvements for keyboards with large dictionaries
Older version, yet still supported: 10.0.14267.1004	Fast ring: February 24, 2016	General user experience Support for Visual Voicemail on Dual-SIM devices Bug fixes Fixed an issue that caused the Lumia 550 to fail to load Fixes an issue that caused Visual Voicemail notifications not to appear
Older version, yet still supported: 10.0.14283.1000	Fast ring: March 10, 2016	General user experience Added missed call and voicemail waiting indicators to tabs in Phone app Live tiles now refresh all at once rather than one at a time Live tile badge and content updates will appear at the same time Apps will now launch faster from Start if incoming Live tile updates occur at the same time Outlook Mail and Calendar Added ability to turn off message preview text Added "Move to Junk" option in context menu Added "I'll be late" button in meeting notifications Bug fixes Background behind the All apps list should now have an overlay Title's of songs in volume control should not flicker Devices should no longer hang or reboot while typing Live tiles should no longer unexpectedly clear notifications Start screen background should no longer flicker while scrolling Icons should now display properly at 350% DPI "More notifications" message in Action Center should now format properly Pressing "@" should no longer result in pasting clipboard contents in certain languages Custom sounds should now play properly Wireless display connection issues have been fixed
Older version, yet still supported: 10.0.14291.1001	Fast ring: March 17, 2016	General user experience Increased the size of the close button of tabs in Edge Alarm & Clock app introduces a new inline time picker and improved design for creating and editing alarms and timers Maps One-tap access to search and directions from anywhere Multiple searches and directions are layered on top of each other and user can view them simultaneously or switch between them User can now minimize search results, directions, and location info to view only the map User can see labels for search results directly on the map instead of having numbers to match between the map and the list Cortana can now give turn-by-turn directions Improved the logic for nearby searches Added the ability to search in the 3D cities list User can now access their favorites offline and add notes to them, Updated the turn-by-turn design to improve glanceability and landscape layout Feedback Hub The Insider Hub and Windows Feedback apps are replaced by a single app which is called the Feedback Hub in this build Bug fixes Fixed the issue where connectivity to older Wi-Fi networks using the WEP encryption security method may be broken Fixed an issue resulting in slower text input speed the more words were typed Improved Word Flow recognition of longer words The All apps list has been updated to now follow the “Make Text Larger” ease of access setting Fixed an issue where Settings would sometimes list unresolved app names under Extras Fixed an issue where touch targets could be out of alignment in the Photos picker
Older version, yet still supported: 10.0.14295.1005	Fast ring: March 25, 2016 Slow ring: March 30, 2016	Bug fixes Fixed the issue where resetting and restoring from a previous backup would fail leaving blank grey titles on Start Fixed the issue where new languages and keyboards were not downloading
Older version, yet still supported: 10.0.14322.1000	Fast ring: April 14, 2016	General user experience Updated emoji design Camera button replaces the back button on the Lock screen Media controls are now shown on the top portion of the lock screen USB Ethernet adapter Support with Continuum Ability to comment in the Feedback Hub Action Center improvements Visual changes to Action Center and notifications Updated Cortana notifications Priority levels can now be set for app notifications in the Action Center Quick Actions can be better customized now Settings app Icons for individual settings pages New "Navigation Bar" settings page New "Glance Screen" settings page Battery usage and battery saver are now on a "Battery" Settings page, with extended features for managing individual apps Windows Update now has an "Active hours" setting that prevents automatic restarts during the set time Cortana improvements Ability to add reminders from photos and UWP content Microsoft Edge improvements Users no longer need to open the context menu for copy/paste operations Tabs opened by other apps now close with the back button Bug fixes Fixed an issue that caused screen flickering while watching a full screen video or when the user first launched Windows Camera Tuned the volume ramp up for alarms Updated the reminder and alert notification logic during calls Fixed an issue where pressing the hardware volume controls crashed Netflix Fixed issues where Chinese Input Method Editor and the Chinese 12-key keyboard Fixed an issue where swiping from Start to the All apps list would get stuck after exiting Continuum Fix for a problem that caused music playback to get occasionally interrupted Fixed an issue where the keyboard would get dismissed when the user tapped the first key after having interacted with the app bar Fixed an issue where an auto-correction revert would get auto-corrected again Fixed an issue with locking and unlocking which caused the Start Screen to get stuck at "Resuming..." Fixed an issue where the keyboard would show all black above the Lock screen when responding to a notification Bing images on the lock screen now appear correctly Task Switcher now has a Windows logo for the Start Screen Fixed an issue where calls stopped ringing if an SMS notification arrived Fixed an issue with the app name getting truncated on the Start Screen Volume control will no longer incorrectly show controls for headphones after they are removed Notification text in banners and Action center will now follow the “Text Scaling” setting
Older version, yet still supported: 10.0.14327.1000	Fast ring: April 20, 2016	General user experience App update notifications have returned Cortana and keyboard voice input are now available in Mexican Spanish, Brazilian Portuguese, and Canadian French Skype integration in Microsoft Messaging has been removed "Messaging everywhere" feature which enables users to send and receive text messages from a PC with the same Microsoft account Swipe left to delete text messages and an "undo" button to recover accidentally removed messages Wi-Fi Hotspot 2.0 which allows users to move between hotspots without requiring them to re-authenticate every time Users can now abort an auto correction by tapping on the word that is to be autocorrected Windows Insider app is no longer required. User may switch builds from a new page in the Settings app Bug fixes Fixed an issue where a phone's screen would become unresponsive Fixed an issue where Windows Hello stopped working Fixed an issue that caused the "space" and "enter" keys to cease working on the keyboard Fixed an issue which prevented many apps from launching from the Start or All Apps screen in the previous preview build Glance screen will now reflect text scaling settings set by Ease of Access Fixed an issue where various emoji couldn't be removed from the text box of an interactive notification Fixed an issue where tethering over Bluetooth didn't work if Bluetooth had never been turned on before Fixed an issue where a sample image couldn't be selected as the lock screen background
Older version, yet still supported: 10.0.14328.1000	Fast ring: April 22, 2016	General user experience Added the ability to reset the data of an app in case of corruption Cortana Cortana will inform users on PC if their Cortana-enabled mobile device is low on battery Cortana can share map directions from a Cortana-enabled mobile device to a PC, and vice-versa
Older version, yet still supported: 10.0.14332.1001	Fast ring: April 26, 2016	General user experience Improvements to the share UI for Cortana Reminders Cortana now supports Office 365 account integration Auto Brightness is now default on supported phones after hard-resets User can now choose how frequently he/she should be asked for Windows Hello authentication Pressing and holding the camera button on the action center will now launch the Camera app Performance improvements to the Settings app Bug fixes Fixed problems with some devices being unable to take photos Fixed an issue with typed text becoming invisible Fixed issue auto-capitalization issue of the Italian keyboard Fixed an issue where Cyrillic characters would be lowercase in list headers (for example, in the All apps list) Fixed an issue where pulling headphones out to answer a call while music was playing would result in the music playing out loud once the call had ended Fixed an issue that that prevented the user from renaming the device Corrected the position of Lock screen quick status numbers
Older version, yet still supported: 10.0.14342.1001	Fast ring: May 16, 2016	General user experience Swipe navigation in Microsoft Edge. Swipe from anywhere on the page to get back to your previous page. Apps for websites, to redirect certain websites to open with an app instead. Feedback Hub improvements. Bug fixes Fixed an issue causing installation of mobile builds to fail with Error 80070002 Language and Speech Packs should download without any errors. Fixed the issue causing DRM-protected content from services like Groove Music, Microsoft Movies & TV, Netflix, Amazon Instant Video or Hulu to fail on playback with 0x8004C029 or 0x8004C503 errors. Fixed the issue where some users with some non-English keyboards were not able to enter letters such as w, y, and a when typing into the address bar of the Edge browser. Fixed the issue causing your phone to lock up and reboot when it receives a notification from an app that has “Keep notifications private on the lock screen” turned on under Settings > System > Notifications & actions. Increased font size and improved spacing of the data migration page after receiving an update. Polished icons used to identify pages in the Settings app – in particular, updated battery icon to be more consistent with the weight of the other icons. Improved performance when retrieving updated GPS coordinates while driving. Goodbye message on shutdown will now remain visible until the last moment, to make it easier to determine when your device is off. Polished the look of media controls on the Lock screen. When the user presses one of the media control buttons, it appears “pressed”. Fixed an issue where some apps, including Tweetium, would crash on launch. Fixed an issue where Action Center’s context menus would appear in the wrong orientation if the app underneath was in landscape mode. Fixed an issue where Lumia 435, 532, 535 and 540 would fail to record video, as well as an issue where advanced camera settings were not preserved when taking a photo with the Lumia 435, resulting in the photo being taken with default settings instead. Fixed an issue where the same device might be listed multiple times under Connect. Fixed an issue where quickly pressing the power button twice when Windows Hello is enabled could result in the display appearing stuck off. Fixed the issue where Groove Music might show an error saying “Can’t play – Another app is controlling your sound right now”. When delayed lock is setup, Windows Hello will now say “Swipe up to dismiss the lock screen”, rather than looking for your iris. Fixed an issue where Glance wouldn’t be displayed when hovering hand over proximity sensor. Fixed an issue where multiple UWPs might start crashing on launch after getting stuck on their splash screen.
Older version, yet still supported: 10.0.14342.1003	Fast ring: May 18, 2016	Improvements to reliability, performance and stability
Latest preview version of a future release: 10.0.14342.1004>	Fast ring: May 25, 2016 Slow ring: June 1, 2016	Fixes for battery life issues Fixes for device heating issues