Windows 10 build 9901

Windows 10 build 9901 is a build of Windows 10, which was uploaded to BetaArchive on 14 December 2014.
== Editions and keys ==
Edition / SKU Name 	Key
Core 	334NH-RXG76-64THK-C7CKG-D3VPT
Professional 	NKJFK-GPHP7-G8C3J-P6JXR-HQRJR
ProfessionalWMC (edition upgrade only)	GBFNG-2X3TC-8R27F-RMKYB-JK7QT
Enterprise 	PBHCJ-Q2NYD-2PX34-T2TD6-233PK
== New features and changes ==
===Applications===
Several applications which were previously absent in build 9900 saw a reintroduction in this build with a new design to fit with the overall aesthetics of the operating system, which includes the Alarms, Calculator, Camera, Sound Recorder, Maps and Photos applications. Some applications are also new to this build, which are the Contact Support and Get Started applications; however, the servers required for them to operate have been down long ago.
Additionally, a new Store (Beta) application has been added, serving as a replacement for the existing Windows 8.x Store program. However, similar to the Contact Support and Get Started applications, the required servers for it to function have been down long ago.
====Alarms====
In addition to the redesign, a new World Clock section has been included, which allows the user to view the clock from all over the world.
9901Alarms-About 02.png|Alarms page
9901Alarms-About 05.png|World Clock page
9901Alarms-About 04.png|Timer page
9901Alarms-About 03.png|Stopwatch page
9901Alarms-About 01.png|About
==== Calculator ====
9901Alarms-About 06.png|Standard
9901Alarms-About 08.png|Scientific
9901Alarms-About 07.png|Programmer
9901Alarms-About 09.png|Unit conversion and About
==== Camera (as Camera Beta) ====
9901Alarms-About 10.png
==== Maps ====
9901Alarms-About 16.png|Main page
9901Alarms-About 19.png|Search
9901Alarms-About 17.png|Directions
9901Alarms-About 18.png|Favorites
9901Alarms-About 20.png|Settings
==== Photos ====
Photos has been updated with a new home page that show images as grids and additionally display image albums, instead of prompting the user to browse for image files. A new Enhance option has been added to the Basic fixes group of the image editor, while the Auto fix group has been renamed to Filters. In addition to this, an option to display the image's details alongside with the Share, Enhance and Send feedback buttons has been added to the image viewer, while the Open with option has been removed. 
In this build, the application identifies itself as "Raconteur App".
9901Alarms-About 25.png|Collection page
9901Alarms-About 26.png|Settings page
9901Alarms-About 21.png|Send feedback
9901Alarms-About 24.png|Image viewer
Photos 7 b1.png|Ditto, previous version
9901Alarms-About 23.png|Image editor
Photos 11 b1.png|Ditto, previous version
9901Alarms-About 22.png|Image details
==== Sound Recorder ====
9901Alarms-About 27.png|Main page
Sound Recorder 2 b1.png|Recording
Sound Recorder 3 b1.png|Records viewer
9901Alarms-About 28.png|About
==== Get started ====
9901Alarms-About 15.png|Splash screen
9901Alarms-About 14.png|Main page
==== Contact Support ====
9901Alarms-About 12.png|Splash screen
9901Alarms-About 11.png|Main page
==== Store (Beta) ====
9901Alarms-About 29.png|Main page
=== User interface ===
The date/time flyout has been updated to feature a flatter design that matches with the overall design of the system, in addition to removing the analog clock. While the flyout's existence was referenced in build 9900, this is the first build to have it working. It can be manually enabled by merging the following registry entry:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell]
"UseWin32TrayClockExperience"=dword:00000000
9901Alarms-About 13.png|Date and time flyout
Additionally, the XAML start menu now opens, with it now showing the current logged in user name instead of the placeholder "Groot", and the power menu now opens properly. However, it is mostly non-functional due to not showing any applications. It can be manually enabled by merging the following registry entry:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\ImmersiveShell\Launcher]
"UseExperience"=dword:00000001
9901Alarms-About 30.png|Start menu
==Bugs and quirks==
===User interface===
When window auto-colorization is enabled, the borders of window thumbnails on the taskbar remain unchanged in color, even when the wallpaper is changed. This problem can be resolved by either manually adjusting the window color via the Control Panel or by performing a restart.
The search feature is slightly unstable and tends to crash if the searched word does not match with any query.
==Gallery==
File:Win8boot.png|Boot screen
File:9901 StartMenu.png|Start menu
File:9901 Settings.png|Settings app
File:Windows10-10.0.9900-ThumbBorderError.png|Incorrect window thumbnail border color
Category:Windows 10 builds