[Update 6/11/2026: Release notes have now been published to Windows Insider release notes - Windows Insider Program | Microsoft Learn.]   Hello Windows Insiders,   Announcing several new builds today across Beta and Experimental, including a new build train for 26H1!  New build series for Windows 11 26H1  Today we are releasing a new Windows 11 Insider Preview Build train for Windows 11 version 26H1. As mentioned in previous blogs, Insiders in the Experimental (26H1) channel who had since selected to move to the Beta experience, were still receiving the same build version while we worked to introduce a new branch.   Starting today, Insiders in the Experimental (26H1) channel will begin receiving a new 28100 series build number, while we officially introduce a new Beta (26H1) channel based on the 28000 series builds. This enables our goal of giving Windows 11 26H1 Insiders the same choice between Beta and Experimental development branches, with the associated differences outlined in our original blog announcing the program changes. As part of that commitment, Insiders in Experimental (26H1) can easily switch to Beta (26H1), or vice versa, by simply switching the experience selection in Settings > Windows Update > Windows Insider Program. This entails a simple in place upgrade (IPU), meaning no clean reinstallation of Windows is required.   As a reminder, while Insiders do have the ability to specifically select Windows 11 version 26H1 under the Advanced options tab in the Windows Insider settings, Windows 11 26H1 is a targeted release of Windows supporting specific silicon launching this year, including Qualcomm Snapdragon X2 Series devices. It is generally otherwise recommended to stick with the default Windows core version selected within Advanced options.   New builds this week See below for today’s Insider Preview build numbers and detailed release notes:  

• Beta: Build 26220.8575
• Experimental: We do not have a new build for this channel today. Keep an eye out for future flights. 

For those on other specific build versions, here are today’s new builds and release notes:

• Beta (26H1): Build 28020.2236
• Experimental (26H1): Build 28120.2242
• Experimental (Future Platforms) – Including Canary 29500 series:  We do not have a new build for this channel today. Keep an eye out for future flights.  

As a reminder, you can always find your build number in the watermark on bottom right-hand corner of your desktop.  Thanks,  Stephen and the Windows Insider Program team