Windows 11 Insider Preview Builds: Your Top Questions Answered

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Microsoft's Windows Insider Program lets enthusiasts and IT pros test upcoming features before they reach the general public. Recently, the company streamlined its channels to offer more control over which features you try. Below we answer the most common questions about the latest changes, builds, and known issues. Use the anchor links to jump to specific topics.

What is the Windows Insider Program and how does it work?

The Windows Insider Program is a community of users who receive early access to Windows updates. Members test preview builds — unfinished versions of Windows — and provide feedback that shapes the final release. The program is now organized into several channels: the Beta Channel (renamed simply Beta) for near‑final builds with minimal bugs; the Experimental Channel (formerly Dev) for features still being refined; two sub‑channels within Experimental (26000 series for development of version 26H1, and 29500 series for future platforms); and the Release Preview Channel split between versions 24H2/25H2 and version 26H1. This structure lets Insiders choose the risk level they prefer. Microsoft encourages participants to report issues via the Feedback Hub to help improve Windows for everyone.

What are the new Insider channel names and how do they differ?

Microsoft recently rebranded its channels to better reflect their purpose. The Beta Channel is now simply called Beta and remains the most stable preview channel. The Dev Channel was renamed Experimental (Dev) and is for testing features not yet tied to a specific release. Within Experimental, builds numbered in the 26000 series are labeled Experimental (26H1), while the 29500 series is Experimental (Future Platforms). The Release Preview Channel now has two branches: one for devices on Windows 11 version 24H2 or 25H2 called Release Preview 24H2/25H2, and another for version 26H1 called Release Preview 26H1. The transition began with the Dev Channel and will roll out to other channels over time. You can switch between channels in Settings if you have the appropriate permissions.

Can I choose which new features to test?

Yes. One of the biggest changes to the Insider Program is the ability to select which features you want to try. Microsoft is gradually enabling this capability. As a first step, the new channel system allows Microsoft to route different feature sets to different groups. For example, Experimental (Dev) may include early UI experiments, while Beta only includes features that are nearly ready for public release. Over time, Insiders will be able to toggle individual features on or off directly in Windows Settings. This gives you more control over your testing experience and reduces the chance of encountering disruptive bugs. The feature selection option is expected to appear in a future build, and Microsoft will provide more details in its official blog posts.

What is new in Windows 11 Insider Preview Build 26220.8474?

Released on May 15, 2026 to the Beta Channel, Build 26220.8474 focuses on behind‑the‑scenes improvements. The most notable change is an enhancement to the Simple Service Discovery Protocol (SSDP) that makes its notifications more reliable. SSDP is used by network devices to announce their presence, and this fix helps prevent the service from becoming unresponsive. There is one known issue: when using the Reset this PC feature, your computer may get stuck. To complete the reset successfully, Microsoft recommends choosing the cloud download option (Cloud PBR) instead of the local reinstall. No other major new features are included in this build — it is primarily a stability update for Beta Channel testers.

What features are introduced in Build 26300.8493?

Released on the same day, May 15, 2026, but to the Experimental Channel (formerly Dev), Build 26300.8493 includes a long‑requested feature: the ability to change the taskbar position. You can now move the taskbar to the top, left, or right side of the screen via Settings > Personalization > Taskbar > Taskbar Behaviors. Microsoft assures that tooltips, flyouts, and animations will still originate from wherever you place the taskbar, and settings like “small taskbar” and “never combine” remain functional. This feature is being rolled out gradually, so not all Experimental Channel users will see it immediately. The build also includes other under‑the‑hood improvements not yet documented. Expect more details as the build reaches a wider audience.

What known issues are there in these preview builds?

Each Insider build comes with its own set of known issues that Microsoft lists in the release notes. For Build 26220.8474 (Beta), the main problem is that “Reset this PC” may get stuck. To work around it, use the cloud download option. For Build 26300.8493 (Experimental), Microsoft has not yet published a complete list of known issues, but because it is an experimental build, expect more bugs than in Beta. Common issues across the Insider Program include app crashes, driver incompatibilities, and occasional screen flickering. Always read the full announcement on the Windows Blog before installing a build, and be prepared to roll back using the Recovery options if needed. You can also report new issues through the Feedback Hub.

How can I join the Windows Insider Program?

To start testing preview builds, go to Settings > Windows Update > Windows Insider Program and click Get started. You will need to sign in with a Microsoft account and agree to the terms. Then choose a channel: Release Preview for the least risk, Beta for stable previews, or Experimental for the newest — and buggiest — features. Note that you may need to register your device and that some channels have limited availability. Once enrolled, you’ll receive builds automatically through Windows Update. Keep in mind that preview builds are not fully tested, so it’s wise to back up your data before installing. You can leave the program anytime through the same settings page.