Fast リング:
2015年2月12日
Slow リング:
2015年2月12日

• 最初のプレビュー版。一部の機種のみ対応。

User interface

• Home screen wallpaper displayed behind translucent tiles rather than within them^[19]
• Live tiles can be tall in size^[20]
• Updated design for context menus

General user experience

• Ability to expand notifications^[21]
• Actionable notifications^[22]
• Action Center with additional settings toggles and same design across Windows 10 devices^[22]
• App list redesigned with wallpaper as background, recent installed apps at top and ability to search for apps^[20][22]
• Keyboard contains virtual pointing stick for text selection and a voice input button^[22]
• Notifications can be synchronized between other Windows 10 devices^[19]
• Press and hold on any toggle in Action Center takes you to respective settings of that option^[23]
• Reminder of coming calendar events when turning the device off^[24]

Security features

• Device encryption option

Apps

• New file explorer app^[25]
• Rendering engine developed in Microsoft Edge hosted in Internet Explorer^[26]
• Standard camera app changed to match functionality and appearance of Lumia Camera app^[19]

"Universal" apps

• Alarms app, adding world clock, timer, and stopwatch modes^[27]
• Calculator app with a built in unit converter^[28]
• Photos app with OneDrive synchronization, collections and automatic photo enhancements^[22]
• Settings app with the same categorization and layout on Windows 10 devices^[20][22]
• Sound recording app added^[20]

Fast リング:
2015年4月10日

• 対応機種が増加した。

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^[20]
• LED notification support for individual apps^[31]
• Pen and inking support^[32]
• Possibility for speech input in virtually any data field one can type.^[33][34]
• Possibility to delete the primary Microsoft account without resetting the device^[31]
• Possibility to set battery saver threshold anywhere from 60% to 5% battery^[35]
• Smart dialing^[36]
• Updated app switcher that moves from left to right, up to 15 recently used apps and new grid layout for large-screen devices^[37]

Security features

• App permissions for location^[31]

Windows apps

• Maps app with Here Maps data, Cortana integration, turn-by-turn navigation^[19][22]
• Music app with OneDrive syncing of music and playlists^[22][38]
• Outlook mail and Outlook calendar^[37]
• People app which aggregates people across social networks and is synced with Windows 10 devices^[22][38]
• Phone and Messaging apps
• A new web browser app (codenamed "Project Spartan")^[39]

Fast リング:
2015年4月21日

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

Fast リング:
2015年5月14日

User interface

• New accent colors^[45]
• New live tile animation
• Setting for background transparency^[45]
• Transparent tiles with background within as in Windows Phone 8.1^[46]

General user experience

• Change keyboard language by swiping space bar^[47]
• Long press on QWERTZUIOP letters for number access^[48]

New technology support

• Mouse pointing devices^[49]

Windows apps

• Getting started app
• Office for Windows 10, including Excel, OneNote, PowerPoint, and Word^[50]
• Preview Music
• Preview Video
• Windowsストア beta
• Xbox App

Fast リング:
2015年6月16日

• 旧ビルドからの更新には対応していないため、一旦Windows Phone 8.1にバージョンを下げる必要がある。

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^[53]

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^[54]
• The ability enable and disable OneDrive backups for individual applications.

"Project Spartan"^[55] (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

Fast リング:
2015年6月25日
Slow リング:
2015年7月8日

• Build 10136で発生していた、旧ビルドから更新できない不具合が解消された。

User interface

• Updated icons and visuals (including visual controls)

General user experience

• Flashlight toggle in notification center^[58]
• 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^[59]
• HTTP Live Streaming

Fast リング:
2015年7月10日
Slow リング:
2015年7月22日

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^[62]

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

Fast リング:
2015年8月12日

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^[65]

Fast リング:
2015年9月14日

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^[68][69]

Fast リング:
2015年10月14日

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^[72]
• 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^[73]
• Windows Hello

Fast リング:
2015年10月20日

General user experience

• Cortana can now order automobiles via the Uber service
• Email accounts are now placed under general account settings^[76]
• 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^[77]
• 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^{[19][22][78][79]}
• Support added for Indian English in the Cortana service^[80]
• Block and filter calls and texts^[81]

User interface

• The introductory text no longer states "Windows Phone" or "Windows 10 Mobile" but instead "Windows 10"^[76]

Apps

• Bing Maps now supports offline maps stored on an SD card^[82]
• 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,^[83] and shows how many rings a missed caller has waited^[84]

Fast リング:
2015年10月29日

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^[86]

• 製品版ビルド^[87]。KATANA 01やEveryPhone、Diginnos Mobile DG-W10MおよびKATANA 02に初期搭載された。

General user experience

• Release version of the Lumia 950 XL, 950 and 550
• RTM version of Windows 10 Version 1511 (TH2)
• New feature: Continuum (for supported phones)
• New feature: Windows Hello (for supported phones)

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^[89]
• 有償のアップグレードサービスにてWindows 10 MobileにアップグレードしたMADOSMA Q501およびMADOSMA Q501A、MADOSMA Q501AOに初期搭載されたビルド。

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.
• Windows 10 Mobileでは初となる累積的な更新プログラム。すべてのWindows 10 Mobile端末向けにOTA配信された^[91]。

Bug fixes

• Some minor and general fixes
• Improved upgrade experience from Windows Phone 8.1

Fast リング:
2016年1月8日

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 MS Band use with Cortana on the phone

Fast リング:
2016年2月1日

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

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

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 MSA 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

Bug fixes^[98]

• 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

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^[100]
• Skype "Mojis" added to Messaging + Skype app^[101]

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

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

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
• Titles 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