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Announcing Windows 10 Insider Preview Build 21277


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Hello Windows Insiders, today we are releasing Windows 10 Insider Preview Build 21277 (RS_PRERELEASE) to Windows Insiders in the Dev Channel.

As mentioned here, we are giving Windows Insiders in the Dev Channel the option to receive builds from the RS_PRERELEASE branch. These builds will be offered as an optional update through the “seeker” experience in Windows Update. This means Insiders will have to go and choose to install the currently offered RS_PRERELEASE build. Once they do, they will continue to receive RS_PRERELEASE builds going forward. This optional experience for receiving RS_PRERELEASE builds is just temporary – we plan to move all Insiders in the Dev Channel back to receiving builds from RS_PRERELEASE sometime after the holidays. As a reminder, Dev Channel builds are not matched to a specific Windows 10 release.

Also: features like the updated emoji picker, redesigned touch keyboard, voice typing, theme-aware splash screens, and others that were removed temporarily at the end of October will be returning for Insiders who install this RS_PRERELEASE build. However, please note some of these features will continue to be available only to a subset of Insiders and will get enabled for more Insiders over time.

Be sure to check the list of known issues below. The list of fixes and known issues between FE_RELEASE builds and RS_PRERELEASE builds will NOT be the same.

IMPORTANT NOTE: Once an Insider chooses to install a RS_PRERELEASE build, they cannot move back to receiving FE_RELEASE builds as their device will be on a higher build number. Insiders will still have the option to roll back to a previous version for up to 10 days or until you take another build.

What’s new in Build 21277

Introducing x64 emulation in preview for Windows 10 on ARM PCs

Windows Insiders with ARM PCs who install this build can try out x64 emulation by installing x64 apps from the Microsoft Store or from any other location of their choosing. For more details on this experience, please head on over and read this blog post from Hari Pulapaka!

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