Announcing Windows 11 Insider Preview Build 22478

UPDATE 10/15: We are starting to roll out cumulative Update Build 22478.1012 (KB5007328). This update does not include anything new and is designed to test our servicing pipeline for builds in the Dev Channel.


Hello Windows Insiders, today we are releasing Windows 11 Insider Preview Build 22478 to the Dev Channel.

October has been a big month for us. Not only did we launch Windows 11 to the world with the help of you, our Windows Insiders, we’re also celebrating our 7 year anniversary. To celebrate our anniversary this year, we are releasing special desktop backgrounds designed by the Microsoft Design Team to show off being Microsoft and Windows 11 fans! Download the special background here for dark theme and here for light theme.

Back in July, the Microsoft Design Team announced refreshed and new Fluent-designed emoji that would roll out across all of Microsoft 365 – including Windows. We are Excited to be giving Windows Insiders a “first look” at how our new emoji design will look in Windows 11 starting with today’s Dev Channel build.

Emoji have become part of the way we communicate. Extending our expression by providing humor, feelings, and fun. You will notice we have redesigned all the emoji and introduced some nostalgia for our fans by making the standard paperclip emoji our beloved Clippy! As part of this rollout, we’re adding support for Unicode emoji up to Emoji 13.1 which includes new emoji such as face in the clouds, heart on fire, space with spiral eyes plus many more!

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To check out the new emoji, just open up the emoji panel (WIN + . )!

After previewing these with Windows Insiders, we plan to bring these new emoji to everyone on Windows 11 via a future servicing update.



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The following two issues have been addressed with Microsoft Edge version 95, currently live for Microsoft Edge Insiders, and as such we’re removing them from the known issues list:






NOTE: Some fixes noted here in Insider Preview builds from the active development branch may make their way into the servicing updates for the released version of Windows 11 that became generally available on October 5th.





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We are beginning to test a new process for delivering new update improvements to our customers outside of major OS updates with Windows Insiders in the Dev Channel starting with Build 22478. Through the Update Stack Package, we can deliver improvements to the update experience prior to the PC taking a monthly or Feature Update. The Update Stack Package will help ensure that your PC has the highest likelihood of successfully installing new updates with the best and least disruptive experience available.

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Currently, the Update Stack Package is limited to a very small set of update-related system files that are developed independently of the OS. By testing this process first with Windows Insiders, we hope to expand the scope and the frequency of releases in the future.

Update Stack Packages will be delivered to Insiders through Windows Update just like builds and cumulative updates are. Insiders in the Dev Channel today can go to Settings > Windows Update and check for updates to receive the Update Stack Package.

We have moved the Dev Channel back to receiving builds from our active development branch (RS_PRERELEASE). These builds are from the earliest stage in a new development cycle with the latest work-in-progress code from our engineers. These aren’t always stable builds, and sometimes you will see issues that block key activities or require workarounds while flighting in the Dev Channel. It is important to make sure you read the known issues listed in our blog posts as we document many of these issues with each flight.

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These builds are also not matched to a specific release. New features and OS improvements from these builds could show up in future Windows releases when they’re ready, and we may deliver them as full OS updates or servicing releases.

Build numbers are higher in the Dev Channel than the Windows 11 preview builds in the Beta and Release Preview Channels. You will not be able to switch from the Dev Channel to the Beta or Release Preview Channels without doing a clean install back to the released version of Windows 11 currently.

Are you not seeing any of the features listed for this build? Check your Windows Insider Settings to make sure you’re in the Dev Channel. Submit feedback here to let us know if things weren’t working the way you expected.

The desktop watermark you see at the lower right corner of your desktop is normal for these pre-release builds.

Amanda & Brandon

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