Yesterday, Microsoft released Windows 10 Mobile build 14371 to the Fast ring, promising a PC build soon. As it turns out, "soon" is today.
As it was with yesterday's Mobile build, build 14371 for PCs doesn't contain any major new front-facing features. This isn't a surprise, as the build is a preview for the Windows 10 Anniversary Update, which is slated to arrive next month.
The main changes noted are activation improvements. Here are the release notes:
Activation Improvements: We’ve received feedback from Windows Insiders who have run into activation issues on Genuine Windows devices after making changes to device hardware such as replacing a hard drive or motherboard. As part of the Windows 10 Anniversary Update and starting with this Insider Preview build, we’re introducing the Activation Troubleshooter that will help you address most commonly encountered activation issues on Genuine Windows devices including those caused by hardware changes. For example – if your device has a digital license (formerly called “digital entitlement”) for Windows 10 Pro from a previously installed activated Windows 10 build but you accidentally re-installed Windows 10 Home on such a device, the troubleshooter will automatically guide you through upgrading to Windows 10 Pro and activate Windows. You can launch the troubleshooter by going to Settings > Update & security > Activation and select Troubleshoot. Remember, Windows 10 Insider Preview builds are intended to be installed on Genuine Windows devices.
Based on Insider feedback, we are also introducing the ability to link your Microsoft account (MSA) to the activation digital license with this Insider Preview build. If you already used an MSA to log in to your activated Windows 10 Home or Pro device, your MSA will be automatically linked. You can use this MSA linked digital license to re-activate your Genuine Windows 10 device by running the Activation troubleshooter, if you run into Activation issues caused by hardware changes.
If you're on the Fast ring, you can grab the new build by heading over to Settings -> Update & security -> Windows Update -> Check for updates. If you're not, head over to Windows Update and go to Advanced options. Once there, turn on Insider builds. When your PC restarts, set it to the Fast ring.
Source: Windows Blog