Windows 11 version 26H2 build 26300.9550 now generally available



 Windows IT Pro Blog:

Windows 11, version 26H2 is now generally available, delivering the next annual feature update for Windows 11. Built on the same servicing foundation as Windows 11, versions 25H2 or 24H2, version 26H2 continues Microsoft focus on providing a predictable, low-disruption update experience for organizations while delivering the latest Windows innovations, security improvements, and management enhancements.

Windows 11, version 26H2 is delivered as an enablement package for eligible devices running Windows 11, versions 25H2 or 24H2. This means you can move to the latest release with minimal deployment overhead and a streamlined installation experience.


What is Windows 11, version 26H2?​

Windows 11, version 26H2 is the latest annual feature update for Windows 11 and continues Microsoft annual release cadence for commercial customers.

Like version 25H2, version 26H2 shares the same servicing branch and underlying code base as previous releases. New features and capabilities have been delivered to supported devices through monthly cumulative updates, with some functionality remaining dormant until activated by the version 26H2 enablement package. This approach reduces disruption while simplifying validation and deployment planning.

Why an enablement package?​

Traditional Windows feature updates often required a full operating system upgrade. For eligible devices running Windows 11, versions 25H2 or 24H2, version 26H2 is activated through a lightweight enablement package.

An enablement package:
  • Activates features already present on the device.
  • Installs similarly to a monthly quality update.
  • Requires a small download.
  • Typically results in faster installation times.
  • Allows your organization to use existing servicing and deployment processes.
Because versions 26H2, 25H2, and 24H2 share a common servicing branch, many organizations might find that validating version 26H2 requires less effort than a traditional feature update.

KB5121794 Enablement Package for 64-bit Windows 11 26H2​
Windows11.0-KB5121794-x64.msu (174 KB)​


OR​

KB5121794 Enablement Package for ARM64 Windows 11 26H2​
Windows11.0-KB5121794-arm64.msu (174 KB)​


What's new in Windows 11, version 26H2​

Windows 11, version 26H2 bundles features and enhancements gradually rolled out over the last year to versions 25H2 and 24H2 in the areas of security, management, accessibility, and productivity.

Security improvements​

Windows continues to build on Microsoft commitment to security by default and security by design.
  • Administrator protection provides just-in-time administrative privileges and profile separation to help harden Windows against elevation-of-privilege attacks. You can enable it through Microsoft Intune or Group Policy.

  • Built-in Sysmon functionality in Windows enables you to capture system events that security tools can use for threat detection. Sysmon is off by default. You can configure it to capture the events your organization needs.

  • Smart App Control can now be turned on or off without requiring a clean installation of Windows, making it easier to block untrusted or potentially harmful apps.

  • Windows Hello Enhanced Sign-in Security expands support to compatible peripheral fingerprint sensors. As such, enhanced biometric sign-in protection is available on more Windows 11 PCs.

  • Post-quantum cryptography improvements include API support for NIST-standardized ML-KEM and ML-DSA algorithms. They include support for key exchange, signing, and decryption through CNG and .NET.
  • Driver security enhancements change how the Windows kernel trusts third-party drivers. They remove default trust for cross-signed drivers while maintaining support for WHCP and designated trusted legacy drivers.

Management and deployment enhancements​

Windows 11, version 26H2 introduces improvements designed to help IT administrators deploy, manage, and secure devices at scale.
  • Windows Autopilot device preparation supports device association. It helps organizations identify trusted devices before enrollment and enabling device-targeted policies, automatic corporate device enrollment, and additional OOBE customization.
  • Windows settings backup and restore expands first sign-in restore to Microsoft Entra hybrid joined devices, Cloud PCs, and multi-user environments. Use it to restore user settings and Microsoft Store apps during device refreshes, upgrades, and migrations.
  • Point-in-time restore for Windows provides another recovery option. Roll back a PC, including apps, settings, and personal files, to a recent automatic restore point.

  • Policy-based app removal gives organizations more flexibility to remove preinstalled Microsoft apps on Enterprise and Education devices. Just specify additional MSIX and APPX packages through Group Policy.
  • RSAT on Arm64 enables IT administrators to use tools including Server Manager, Group Policy Management Tools, DNS Server Tools, DHCP Server Tools, and Active Directory management tools on Windows 11 Arm64 devices.
  • App update orchestration allows participating applications to coordinate updates with Windows Update for improved scheduling and a more streamlined update experience

User experience and accessibility enhancements​

Windows 11, version 26H2 continues to improve everyday productivity with enhancements across Windows experiences.
  • File Explorer adds productivity enhancements including AI actions for working with supported images and summarizing OneDrive and SharePoint documents. Also included are quick actions for work and school accounts, support for additional archive formats, and performance improvements.

  • Windows Search makes results easier to find and understand with previews. It better handles typos and partial app names, identifies result types clearer, and automatically indexes frequently used folders.
  • Start and taskbar enhancements provide additional ways to customize the Windows workspace. Begin with new Start menu views and sizing options, additional taskbar positions, and a smaller taskbar option.

  • Task Manager provides greater visibility into NPU usage, including NPU utilization and memory information. You can also identify applications running in an AppContainer.

  • Magnifier adds clearer screen reader announcements, more precise zoom controls, and screen tint options to improve readability.

  • Narrator adds Braille Viewer, improves reading and navigation in Microsoft Word, and provides more control over how information about on-screen controls is announced.

  • Voice access adds natural language commanding on supported Copilot+ PCs, additional language support, and Voice Isolation to help improve recognition in environments with other speakers or background noise.

Now enabled by default​

Some features that were behind temporary commercial control in Windows 11, version 25H2 are now enabled by default in version 26H2. These include:
  • Windows settings backup, which helps preserve supported Windows settings and Microsoft Store app lists for recovery and device replacement scenarios. Existing administrator-configured policies are still honored.
  • App-specific taskbar actions that help users access common actions directly from taskbar experiences.
  • File Explorer improvements focused on improving navigation and usability within File Explorer.
Some of these features have eligibility requirements. Please see related technical documentation for more details.

For a closer look at new features and enhancements added to Windows 11 since version 25H2, please see What's new in Windows 11, version 26H2.

Servicing and support lifecycle​

Windows 11, version 26H2 continues Microsoft annual Windows feature update cadence. Installing Windows 11, version 26H2 resets the support lifecycle for supported editions, as noted here:

Edition​
Support duration​
Home24 months
Pro24 months
Enterprise36 months
Education36 months

Deployment considerations​

For devices currently running Windows 11, version 25H2 or version 24H2, you can use existing deployment frameworks and update rings to validate and deploy version 26H2.

As with any release, we recommend that you:
  • Validate version 26H2 in pilot environments.
  • Test business-critical applications, representative hardware, and workflows.
  • Expand deployment through existing update rings.
  • Monitor deployment health and known issues.
It is also a good time to review security and compliance requirements and educate support personnel on any new functionality.

Because this release uses servicing technology like that used for monthly cumulative updates, many organizations should experience a streamlined deployment process.

Tools and resources​

Deployment, security, and management tools have been refreshed for this update. These include:
We've also updated key references and documentation:
Monthly release notes for Windows 11, version 26H2 will be added to the update history page beginning with the first monthly security update for version 26H2, slated for October 13, 2026.

And, if you're looking for an easy way to keep up on what's new in the world of Windows management, tune in to my new podcast, Ctrl + Manage. The first episode debuts this Thursday, October 1, here on the Tech Community. Click here to save the date and tune in live.

Start planning for Windows 11, version 26H2​

Windows 11, version 26H2 is designed to make moving to the latest version of Windows familiar and straightforward. If you're managing eligible devices on Windows 11, version 25H2 or 24H2, start by validating the update with a targeted set of devices, applications, and workflows. Then expand your deployment using the tools and processes you already have in place.

As always, we want to hear from you. Drop a comment below and let us know what's working, what questions you have, and what we can do to make managing Windows easier for your organization.


 Source:


See also:


Check Windows Updates


UUP Dump:

64-bit ISO download:

ARM64 ISO download:

 

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Last edited:
Some bugs are harder to fix than others. If one waited till all (known) bugs were fixed, there would never be a new release.

This has been a truism all my life - I started programming before the 1st IBM pc was fabricated
Well, since I spend a fair amount of my life developing flight critical avionics, we actually DID have to wait for all the "known" bugs to be fixed! Yes, now and again, something would still slip by, but it sure wasn't a "known" bug or heads would roll!

For Windows we're the Microsoft verification and testing crew, don't you know. However, when you're developing avionics, you just can't toss that ball over the wall and tell the pilots to let us know if the air data computer crapped out or stopped outputting reliable data!

I started my computer career with IBM in 1966...
 

My Computers My Computers

  • At a glance

    Win 11 Pro 26H2, Build 26300.9550Intel Core i5 14500, 14th Generation64GB DDR4GeForce RTX 4060
    OS
    Win 11 Pro 26H2, Build 26300.9550
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Brew
    CPU
    Intel Core i5 14500, 14th Generation
    Motherboard
    Gigabyte B760M G P WIFI
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    PSU
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    LIAN LI LANCOOL 216 E-ATX PC Case
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    Lots of fans!
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    Mouse
    Logitech G305
    Internet Speed
    Verizon FiOS 1GB
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    Malware Bytes & Windows Defender Security
  • At a glance

    Win 11 Pro 25H2, Build 26300.9550Intel Core i5 1440032GB DDR5Intel 700 Embedded GPU
    Operating System
    Win 11 Pro 25H2, Build 26300.9550
    Computer type
    PC/Desktop
    Manufacturer/Model
    Home Brew
    CPU
    Intel Core i5 14400
    Motherboard
    Gigabyte B760M DS3H AX
    Memory
    32GB DDR5
    Graphics card(s)
    Intel 700 Embedded GPU
    Sound Card
    Realtek Embedded
    Monitor(s) Displays
    27" HP 1080p
    Screen Resolution
    1920x1080
    Hard Drives
    Crucial P310 2TB NVMe Gen4 SSD
    Samsung EVO 990 2TB NVMe Gen4 SSD
    Samsung 2TB SATA SSD
    Seagate 4TB Ironwolf, rotating HDD secondary backup
    PSU
    Thermaltake Smart BM3 650W
    Case
    Okinos Micro ATX Case
    Cooling
    Fans
    Keyboard
    Microsoft Comfort Curve 2000
    Mouse
    Logitech G305
    Internet Speed
    Verizon FiOS 1GB
    Browser
    Firefox
    Antivirus
    Malware Bytes & Windows Defender Security
  • Nimo N171 17" Laptop, (Intel i3-1215U, 16GB RAM, 2TB NVMe, Win11 Pro)
    Acemagic Vista Mini PC V1 (Intel N150, 16GB RAM, 1TB NVMe, Win11 Pro)
    HP ENVY h8-1540t, (24GB RAM, 2TB SSD, 2TB HDD, Win11 Pro)
Well, since I spend a fair amount of my life developing flight critical avionics, we actually DID have to wait for all the "known" bugs to be fixed! Yes, now and again, something would still slip by, but it sure wasn't a "known" bug or heads would roll!

For Windows we're the Microsoft verification and testing crew, don't you know. However, when you're developing avionics, you just can't toss that ball over the wall and tell the pilots to let us know if the air data computer crapped out or stopped outputting reliable data!

I started my computer career with IBM in 1966...
yeah.. I can almost see it.. MS making the software for avionics.. everyone that want to live a long life would take the train then. *LOL* 😅

Microsoft started to go sideways when Bill Gates decided in 2013 to step down in 2014.. after that windows became crap and the word reliability and quality went out the "window"
Only Enterprise LTSC and Server LTSC is still having some quality and reliability
 

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    Manufacturer/Model
    HP Elitebook 840, AsusX53, Aspire E1-572. AsusUX32A, HP Pro3130mt+3010mt, HP Proliant ML150, 3xCustom-PC, i3, i5, i7
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    Manufacturer/Model
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    CPU
    Oldest intel 8088 up to P4 dual core
    Hard Drives
    MFM, IDE, SCSI
For Windows we're the Microsoft verification and testing crew,
A large part of that stems from the QA department being largely disbanded, and having developers QA their own code (good for new code...not so good for regressions).

The Windows Insider program was supposed to pick up the slack for final QA.
 

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Windows 11 Pro 26H2
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Windows 11 Pro 26H2
Computer type
Laptop
Manufacturer/Model
Toshiba
Antivirus
Defender

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