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Microsoft released a new Windows 10 insider preview build 14959 for mobile and PC. Dona Sarkar, in an official blog post, announced the availability of the new build for fast ring Windows 10 users. Checkout the post to know what’s new and improved in this build.


Read the known issues before downloading this build. If you are stuck at 0% downloading build 14951, wait for the timeout to happen before attempting to downloading this build.


Windows 10 Insider Preview Build 14959 for Mobile and PC (


What’s new in the build 14959?

This build for Mobile has been published using the new update publishing system called Unified Update Platform (UUP). It’s the next generation of Microsoft’s delivery technologies to push the updates. One of the biggest community and customer benefits of UUP is the reduction you’ll see in download size on PCs. This has been already started rolling out to Mobile insiders in stages (starting with today’s build), and we expect to see it for PC Insider builds later this year and then IoT, HoloLens.


Microsoft added a new Zoom option in the View menu of Hyper-V Virtual Machines, where you can override the default scaling and set it to 100, 125, 150 or 200 – whichever matches your preference. Microsoft also fixed an issue where certain VMs wouldn’t display the remote desktop connection bar after entering full screen mode.

What are the improvements and fixes in PC build 14959?

Here is the list of fixes and improvements in fast ring Windows Insiders PC build 14959:

  • Microsoft fixed an issue for Insiders resulting in the automatic brightness setting unexpectedly being turned off after upgrading. Microsoft re-enabled automatic brightness adjust for users that have never changed their auto-brightness setting.
  • Fixed an issue for the Insiders on domain connected PCs where they had experienced failure in login when the computer was disconnected from its domain network.
  • Fixed an issue resulting in certain apps, such as Outlook Mail and Calendar, failing to update for some Insiders with the error code 0x800700B7.
  • Fixed an issue for Insiders with certain device models where ejecting an SD card might result in a system crash.
  • Microsoft fixed an issue where disliking one of the Spotlight lock screen images would show the new image immediately, followed by a transition animation from the previous image to the new image.
  • Fixed an issue where launching an app from another app while in Tablet mode no longer launched it side by side.

What are the improvements and fixes in Mobile build 14959?

Here is the list of fixes and improvements in fast ring Windows Insiders Mobile build 14959:

  • The data usage page in Settings > Network & wireless > Data usage has been updated with performance and UI improvements.
  • Fixed issues preventing Insiders from adding cards to Wallet and paying using tap to pay.
  • Fixed an issue resulting in being unexpectedly able to close Start in the task switcher.
  • Microsoft fixed an issue resulting in certain options for default calling app via Settings > System > Phone > Default apps from being unexpectedly missing.
  • They fixed an issue causing apps that play media in the background, such as Groove Music, to stop when Battery Saver turns on.
  • They also fixed an issue Insiders may have experienced where the phone would get into a state where copy/paste wouldn’t work until the device had been restarted.
  • Fixed an issue where Settings might hang after unchecking “Let apps automatically use this VPN connection” in VPN Settings.

What are the known issues for PC and Mobile build 14959?

As you know, it’s a pre release software, delivered from the development branch, it has known/unknown issues. Before going to download and install such pre-release builds, you should at least read the known issues and stay prepare to handle the cases if something goes wrong.


Here’s the list of known issues for PC and Mobile build 14959:

  • If you have a 3rd party antivirus product installed on your PC – your PC might not be able to complete the update to this build and roll-back to the previous build.
  • There’s an issue where Internet Explorer may crash a few seconds after launch and working.
  • If you used the previous ‘date change’ workaround to update to Build 14951 or Build 14955: Please don’t use it any longer! The Microsoft account (MSA) ticket on your device needs to expire and then you’ll be offered today’s build. If you changed your date by 30 years… you’ll want to do a device reset.
  • You will be unable to install additional languages, keyboards, and speech packs on your phone for the next few weeks. If you have existing languages, keyboards, and speech packs installed – they will carry over when you update to new builds. You just can’t install any new ones.



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