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Microsoft has released KB5120998, a major optional preview update for Windows 11 versions 24H2 and 25H2. Released on August 27, 2026, it updates Windows 11 to Build 26100.9278 on version 24H2 and Build 26200.9278 on version 25H2.

The update introduces or begins rolling out a substantial collection of improvements, including:

• redesigned and more useful Windows Search
• automatic indexing of frequently used folders
• faster File Explorer Home
• touch scrolling in File Explorer Recommended
• Administrator Protection with just-in-time elevation
• improved VPN reliability and recovery
• standalone ML-KEM post-quantum cryptography support for TLS
• improved virtual desktop switching
• updated Windows progress indicators
• improved Windows Setup
• better Windows Update sleep behavior
• Windows Update coordination for supported application updates
• Windows Autopilot device preparation improvements
• Microsoft Execution Containers process isolation
• preview support for identifying agentic processes
• Task Manager reliability improvements
• display and brightness fixes
• voice typing and Japanese IME improvements
• Narrator improvements
• classic Outlook search fixes on Japanese Windows installations
• touchpad reliability fixes
• updated Copilot+ PC AI components
• removal of the legacy WMIC command-line utility

This is a preview/non-security cumulative update, and several new features use Microsoft's gradual rollout system. Therefore, two computers with KB5120998 installed may temporarily show different feature sets.

COMPLETE ARTICLE

What Is Windows 11 KB5120998?

KB5120998 is Microsoft's August 2026 optional preview cumulative update for:

Windows version	Updated OS build
Windows 11 24H2	26100.9278
Windows 11 25H2	26200.9278

Microsoft describes the release as containing production-quality improvements, but because it is a preview update, users do not generally need to install it immediately unless they want the latest fixes and features before their broader release.

Many of the features described below are being delivered through a gradual rollout.

That distinction is important.

Gradual rollout

A feature may become available only to some eligible PCs initially and then expand to more devices over time.

Consequently:

KB5120998 installed ≠ every new feature immediately enabled.

This explains why one Windows 11 PC may display a new Search option or Administrator Protection while another PC running apparently the same Windows build does not yet show it.

1. Windows Search Gets a Significant Redesign

Windows Search receives several usability and indexing improvements.

Microsoft says the changes are intended to make Search more dependable, easier to scan and clearer about where results originate.

Simplified Search Home

The Windows Search home screen has been simplified.

Microsoft has reduced visual clutter so users can more easily return to recent searches instead of navigating through unnecessary information.

For users who frequently use:

Start → Search

or the Windows Search box on the taskbar, the interface should feel cleaner.

Search Results Now Show Their Source More Clearly

Windows Search can return information from several locations:

• installed applications
• Windows Settings
• local files
• web results
• Microsoft Store suggestions

Previously, distinguishing between these result types was not always obvious.

Windows now provides clearer information about where a result originates before you select it.

This should reduce situations where a user expects Windows to open a local file but instead selects a web or Store result.

2. You Can Control Web and Microsoft Store Suggestions in Search

A useful new privacy and usability option has been added under:

Settings → Privacy & security → Search

Users can control whether web and Microsoft Store suggestions are displayed alongside local Windows Search results.

This is particularly useful for people who primarily use Windows Search to locate:

• files
• applications
• Control Panel items
• Windows settings
• locally stored documents

rather than online content.

For business PCs, administrators may also prefer a more focused local-search experience.

3. Windows Can Automatically Index Frequently Used Folders

One of the more interesting Windows Search improvements is intelligent expansion of indexing.

Windows can now automatically identify frequently used folders and add relevant locations so their files become easier to find in future searches.

The setting can be managed from:

Settings → Privacy & security → Search → Automatically find additional relevant locations

Microsoft says this allows files from frequently used locations to appear in subsequent search results.

Why this matters

Traditional Windows Search performance depends heavily on the Windows Search index.

If a folder isn't indexed, searching its contents may be slower or less effective.

Automatic identification of useful locations should reduce the amount of manual indexing configuration required by ordinary users.

Possible consideration for large data sets

Users with extremely large collections of files should still monitor indexing behavior and disk activity.

Adding additional locations to the Windows Search index can require Windows to process more files.

This doesn't mean the new feature is harmful; it simply means administrators of systems containing very large document repositories should understand what locations Windows is indexing.

4. File Explorer Home Opens Faster

Microsoft has specifically improved the performance of File Explorer Home.

The company says launching File Explorer Home should now be:

• faster
• more responsive

This can be particularly noticeable on computers where Explorer previously hesitated while populating Home with recent, favorite or recommended files.

This is a welcome improvement because File Explorer is one of the most frequently used Windows components.

5. File Explorer Recommended Section Gets Touch Scrolling

The Recommended section displayed on File Explorer Home now supports touch scrolling.

Users of:

• touchscreen laptops
• tablets
• 2-in-1 Windows devices

can therefore browse the Recommended carousel more naturally using touch gestures.

6. Administrator Protection Begins Rolling Out

One of the most important security changes in this Windows update is Administrator Protection.

Traditional Windows administrator accounts possess powerful privileges that malware may attempt to exploit.

Administrator Protection changes this model by keeping the user in a deprivileged state and granting administrative privileges only when they are actually required.

Microsoft describes this as just-in-time administrative privileges.

How Administrator Protection works

When enabled, Windows doesn't simply leave administrator privileges continuously available.

Instead:

Normal session → administrative operation requested → user authorization → temporary isolated administrator token → operation completes → elevated token is discarded

Microsoft uses a hidden system-managed, profile-separated account to create the isolated administrator token.

The elevated token exists only for the process requiring it and is destroyed when that process ends.

Windows Hello integration

Administrator Protection can use Windows Hello to verify that the user actually intends to authorize the administrative operation.

This provides additional protection against malware attempting to silently acquire elevated permissions.

No automatic elevation

Administrative operations require interactive authorization.

The goal is to prevent applications or malware from silently inheriting powerful administrator rights.

Important clarification

Microsoft explicitly states that Administrator Protection is not classified as a formal security boundary.

Instead, it is a security-hardening feature intended to make elevation-of-privilege attacks more difficult.

7. Is Administrator Protection Enabled Automatically?

No.

With KB5120998, Administrator Protection is off by default.

Organizations can configure it through mechanisms including:

• Group Policy
• Microsoft Intune
• Configuration Service Provider policies
• supported Windows Security configuration as the UI rolls out

Microsoft says the feature is gradually rolling out.

Group Policy configuration

For supported systems, administrators can navigate to:

Computer Configuration → Windows Settings → Security Settings → Local Policies → Security Options

and configure:

User Account Control: Configure type of Admin Approval Mode

to use:

Admin Approval Mode with Administrator protection

A restart is required after enabling Administrator Protection.

Important for IT administrators

Do not enable Administrator Protection across an entire organization without testing it first.

Some older applications, installers, scripts and administrative workflows may assume that administrator credentials, user profiles, mapped network drives or authentication sessions remain available after elevation.

Microsoft documents compatibility considerations involving areas such as:

• elevated applications
• mapped network resources
• SSO credentials
• scheduled tasks
• some installers
• Hyper-V/WSL scenarios
• roaming-profile scenarios

Test important business applications before widespread deployment.

8. VPN Reliability Improvements

KB5120998 also improves Windows networking.

Microsoft has addressed potential background VPN process-related problems that could cause processes to stop responding.

The update improves both:

resiliency and recovery

from these VPN-related conditions.

This isn't a completely new VPN system or protocol. It is primarily a reliability improvement to Windows' VPN-related background processing.

For organizations using VPNs for remote access, improved recovery from stalled processes could reduce situations requiring:

• reconnecting VPN sessions
• restarting applications
• restarting VPN-related processes
• rebooting the computer

depending on the original failure condition.

9. WLAN Report Improvement

Microsoft also improved output from:

netsh wlan show wlanreport

for Japanese users.

The command generates a wireless network report useful when troubleshooting Wi-Fi connectivity.

IT administrators can run it from Command Prompt or Terminal.

10. Windows 11 Expands Post-Quantum Cryptography Support

One of the most technically significant additions is expanded support for post-quantum cryptography (PQC).

KB5120998 allows the ML-KEM post-quantum cryptographic algorithm to be used as a standalone algorithm for TLS key exchange.

Previously introduced hybrid groups remain supported.

What is ML-KEM?

ML-KEM stands for Module-Lattice-Based Key-Encapsulation Mechanism.

It is designed as part of the industry's transition toward cryptographic systems capable of resisting attacks from sufficiently powerful future quantum computers.

Does this mean current encryption is already broken?

No.

The purpose of post-quantum cryptography is largely preparation for future cryptographic threats, not evidence that ordinary TLS encryption has suddenly become unusable.

The industry is transitioning early because systems, protocols, applications and infrastructure can take years to migrate.

Why does PQC matter now?

Sensitive encrypted information captured today could potentially remain valuable years later.

This creates concern around the concept commonly described as:

harvest now, decrypt later

where encrypted traffic is collected now in the hope that future technology will eventually make decryption possible.

Post-quantum cryptography is intended to reduce this future risk.

11. Windows Is Also Preparing Code Signing for the Post-Quantum Era

This TLS improvement is part of a broader Windows cryptographic transition.

Microsoft has separately announced changes to Windows code-signing infrastructure, including stronger signing configurations and preparation for post-quantum signing.

Microsoft currently plans for Windows production signing to transition toward PQC-by-default in 2027.

This is particularly important for software developers.

Applications should avoid hard-coding assumptions such as:

• specific Microsoft certificate thumbprints
• fixed certificate issuers
• specific RSA key sizes
• fixed SHA algorithms
• fixed certificate chains

Microsoft recommends using supported Windows trust APIs and validating whether Windows trusts a signature rather than relying on a particular certificate identity.

12. Virtual Desktop Switching Is Smoother

Users working with multiple Windows desktops should see improved responsiveness.

Switching between virtual desktops is now designed to be:

• smoother
• more responsive

This is especially useful for users separating workspaces—for example:

Desktop 1: Email and browser
Desktop 2: Development tools
Desktop 3: Remote support
Desktop 4: Documentation

13. New Windows Progress Indicators

Microsoft has updated progress indicators displayed across Windows.

The refreshed indicators are intended to provide a more consistent modern appearance during:

• Windows startup
• sign-in
• restart
• shutdown
• Windows Update installation

This is primarily a visual consistency improvement rather than a performance feature.

14. Windows Share Improvements for Work and School Accounts

Users signed into Windows with a work or school account can discover and install relevant applications directly from the Windows Share interface.

The feature can be controlled from:

Settings → System → Share → Show suggested apps in share surfaces

This feature is primarily relevant to organizational environments.

15. Display and Graphics Improvements

The update includes two notable display-related reliability improvements.

Display Settings

Microsoft has improved reliability when navigating to and interacting with:

Settings → System → Display

Brightness after Energy Saver

Windows should now do a better job of remembering the user's previous brightness setting after Energy Saver turns off.

This fixes an annoying situation where brightness may not return as expected after power-saving behavior ends.

16. Task Manager App History Reliability Improved

Microsoft has improved the reliability of the App history information displayed by Task Manager.

Users can access Task Manager using:

Ctrl + Shift + Esc

This improvement is primarily a reliability fix rather than a major Task Manager redesign.

17. Windows Setup Improvements

Microsoft has refined the Windows installation and initial setup experience.

Secondary keyboard selection

Windows Setup now makes selecting—or skipping—a secondary keyboard easier.

This removes unnecessary friction for users who need only one keyboard layout.

Get Started improvements

The Get Started application gains new pages covering:

• application installation
• site pinning
• themes

These are intended to help users personalize newly configured PCs.

18. Windows Update Now Handles Manually Sleeping PCs Better

There is a subtle but useful change to Windows Update behavior.

Suppose you manually put your PC to sleep.

Windows wakes the computer to complete an update.

Previously, depending on configuration, the machine could remain awake afterward.

Windows can now return the computer to sleep after completing the update—even if automatic sleep is configured as Never—when the computer had been manually put to sleep beforehand.

This should be useful for laptops and PCs that users intentionally leave sleeping overnight.

19. Applications Can Coordinate Updates with Windows Update

Microsoft is expanding the Windows Update platform beyond Windows itself.

KB5120998 adds support allowing participating applications to coordinate their updates with Windows Update.

Supported applications can benefit from:

• coordinated scheduling
• streamlined update behavior
• better integration with the Windows update process

This uses Microsoft's Windows Update Orchestration Platform (UOP).

It does not mean that every traditional Windows application will immediately begin updating through Windows Update. Applications need to support the platform.

20. Microsoft Store Improvement for WinUI 3 Applications

Packaged WinUI 3 applications requiring elevation can now support in-app purchases through Microsoft's integrated commerce platform.

This change is primarily relevant to application developers rather than typical Windows users.

21. Windows Autopilot Device Preparation Improvement

Microsoft has made device association for Windows Autopilot device preparation generally available.

Organizations can use it to identify trusted devices before enrollment.

Potential benefits include:

• device-targeted policies
• automatic corporate device enrollment
• additional Out-of-Box Experience customization

This is primarily important to IT departments deploying large numbers of Windows computers.

22. Microsoft Execution Containers Get Process Isolation

Windows introduces Process Isolation for Microsoft Execution Containers (MXC).

MXC provides a lightweight isolation boundary for responsive workloads such as:

• coding agents
• model-generated code

Windows containment technology can restrict access to resources including:

• files
• networking
• user interface components
• other operating-system capabilities

according to policy.

This reflects Microsoft's broader work on safely supporting AI and agent-driven workloads inside Windows.

23. Preview Support for Tagging Agentic Processes

Windows also introduces preview platform support for identifying agentic processes.

Authorized components can assign an opaque agent identifier to a process token.

Windows protects this marking and automatically propagates it to child processes.

When an identified agentic process authenticates through Web Account Manager (WAM), the agent identifier can be included in the authentication request.

Microsoft currently labels this capability as preview, and the identifier format may change in future releases.

This is mostly a platform/developer change today, but it is an important indication of how Windows is evolving to distinguish software agents from ordinary applications and user-driven processes.

24. Japanese IME Reliability Improvement

The update reduces potential hangs when typing using the Japanese Input Method Editor (IME).

This is primarily relevant to Japanese-language users.

25. Voice Typing Settings Are More Reliable

Windows improves persistence of voice typing settings involving:

• automatic punctuation
• voice typing launcher

Windows should therefore do a better job of remembering these preferences.

26. Narrator Natural Voices Improvement

The normal rollout portion of KB5120998 improves Microsoft's Narrator Natural Voices experience.

Natural Voices should install and configure more reliably from the Narrator settings dialog.

This is an important accessibility improvement for users who depend on Windows screen-reading capabilities.

27. RemoteApp Japanese Text Input Fix

Microsoft has improved Japanese text input inside RemoteApp applications.

The fix helps text appear correctly while users type.

This may be especially relevant in enterprise Remote Desktop Services environments.

28. Classic Outlook Search Fix

The update fixes an issue affecting classic Outlook on Japanese-language Windows devices.

Searches involving:

• Sent Items
• Advanced Find

should now display the correct To label and return expected results.

This specifically concerns the documented Japanese-language issue and should not be interpreted as a general redesign of Outlook Search.

29. Touchpad Reliability Improvements

Microsoft has addressed touchpad reliability problems on some devices.

The update improves:

• touchpad gestures
• mouse-drag operations

Users affected by intermittent gesture or drag problems may therefore see an improvement after updating.

30. AI Components Updated on Copilot+ PCs

KB5120998 updates several Windows AI components to version:

1.2608.951.0

The updated components include:

• Image Search
• Content Extraction
• Semantic Analysis
• Settings Model

These AI-component updates apply to Copilot+ PCs. Microsoft notes that although the component packages are included with the cumulative update, they do not install on ordinary non-Copilot+ Windows PCs or Windows Server.

31. Servicing Stack Updated

KB5120998 also incorporates a Servicing Stack Update associated with KB5120997.

The servicing stack is the Windows component responsible for installing Windows updates.

Microsoft says the update improves reliability of the Windows update installation process.

32. WMIC Is Removed from Windows 11 24H2 and 25H2

Another important administrator/developer change is the removal of the old:

Windows Management Instrumentation Command-line utility (WMIC)

Beginning in August 2026, Windows 11 versions 24H2 and 25H2 no longer include WMIC.

It had already been removed by default from newer Windows installations, but it is now also no longer available as a Feature on Demand.

Important distinction

WMIC is removed. WMI is not removed.

Windows Management Instrumentation remains supported.

Administrators should migrate old scripts from commands such as:

wmic cpu get name

toward supported alternatives such as PowerShell CIM cmdlets.

For example:

Get-CimInstance Win32_Processor | Select-Object Name

Organizations should therefore audit old:

• BAT files
• CMD scripts
• login scripts
• inventory tools
• support utilities
• deployment scripts

for WMIC dependencies.

33. Known Issues in KB5120998

Because KB5120998 is a preview update, administrators should review Microsoft's currently documented issues before deploying it widely.

As of September 4, 2026, Microsoft lists several important problems.

Mouse Customization Can Reset on Non-English Windows Installations

On some non-English Windows installations, mouse personalization settings may revert to standard values.

This can affect settings such as:

• mouse cursor
• cursor animations

Microsoft says manually restoring the settings may not solve the issue because the affected Windows components fail to load the settings correctly.

Microsoft is working on a resolution.

Microsoft Teams and New Outlook May Fail on Some ARM PCs

Microsoft has documented a separate issue affecting ARM-based devices after Windows updates released on or after August 11, 2026.

Affected applications can include:

• Microsoft Teams
• new Outlook for Windows

They may fail to launch or unexpectedly close.

Microsoft says classic Outlook, Word and Excel are not known to be affected by this issue.

The problem is particularly likely on new or freshly imaged ARM PCs that haven't installed recent Microsoft Store updates.

Microsoft's current workaround is to:

Microsoft Store → Downloads → Check for updates

and install the latest Auto Super Resolution Package, version 1.0.19.0 or later.

Desktop Background May Turn Black

Another newly documented problem can cause desktop settings to fail to load after KB5120998 or later updates.

On affected systems, the desktop background may become a:

solid black background

Other personalization features such as:

• slideshow settings
• contrast themes

may also be affected.

Microsoft says manually restoring the settings may not work because Windows isn't correctly loading the saved configuration.

A permanent fix is being developed.

34. How to Install KB5120998

Because this is an optional preview update, you can check for it from:

Start → Settings → Windows Update → Advanced options → Optional updates

Look under the available optional updates and select the Windows cumulative preview update if offered.

Should everyone install it immediately?

Not necessarily.

For ordinary home and office PCs where stability is more important than receiving new features early, it is reasonable to wait for Microsoft's normal security/cumulative update channel.

Preview updates are especially useful for:

• IT professionals testing upcoming changes
• users needing a particular included fix
• developers testing compatibility
• organizations evaluating upcoming Windows behavior

Business administrators should generally test preview releases on a limited number of machines before broad deployment.

35. How to Check Whether KB5120998 Is Installed

Press:

Windows + R

type:

winver

and press Enter.

You can also use PowerShell:

Get-ComputerInfo | Select-Object WindowsProductName, WindowsVersion, OsBuildNumber

For installed hotfix information, you can try:

Get-HotFix -Id KB5120998

However, remember that Windows servicing and cumulative-update reporting can vary, so checking the OS build is often useful when confirming the installed Windows level.

Expected builds are:

Version	Build
Windows 11 24H2	26100.9278
Windows 11 25H2	26200.9278

36. Windows 11 24H2 Users Should Also Note End of Support

There is another important point for users still running Windows 11 24H2.

Microsoft says Windows 11 24H2 Home and Pro reach end of updates on:

October 13, 2026

Windows 11 24H2 Enterprise and Education remain supported until:

October 12, 2027.

Home and Pro users still running 24H2 should therefore plan to move to a supported newer Windows 11 release.

37. Which Changes Matter Most?

For ordinary users, the most noticeable improvements are likely to be:

Feature	Likely importance
Faster File Explorer Home	High
Improved Windows Search	High
Search web/Store suggestion control	High
Automatic indexing of useful folders	High
Taskbar/Start changes	High
Improved virtual desktops	Medium
Better brightness persistence	Medium
Updated progress indicators	Low/visual
Touchpad reliability	Medium

For IT administrators and businesses:

Feature	Likely importance
Administrator Protection	Very High
VPN reliability	High
WMIC removal	Very High
Windows Update app orchestration	High
Autopilot device association	High
PQC/ML-KEM	High, strategic
Microsoft Execution Containers	High, emerging
Agentic process identification	High, emerging
Servicing Stack improvements	Medium/High

For developers:

Feature	Likely importance
Post-quantum TLS support	Very High
Future PQC code signing	Very High
Microsoft Execution Containers	High
Agentic process tagging	High
Windows Update Orchestration	High
WinUI 3 commerce/elevation support	Medium/High

FAQ

Is KB5120998 a security update?

No. KB5120998 is an optional preview cumulative update for Windows 11 24H2 and 25H2. It contains new functionality, improvements and fixes ahead of broader servicing.

Which Windows versions receive KB5120998?

It applies to Windows 11:

• version 24H2
• version 25H2

What build does KB5120998 install?

Windows 11 24H2 becomes Build 26100.9278, while Windows 11 25H2 becomes Build 26200.9278.

Why don't I see the new Windows Search features after installing the update?

Microsoft is using a gradual rollout for many new features. The update can therefore be installed while an individual feature remains temporarily unavailable on your PC.

Does File Explorer become faster?

Microsoft specifically states that File Explorer Home now launches faster and is more responsive.

Can Windows Search automatically index additional folders?

Yes. Windows can automatically identify frequently used folders and index relevant locations. The option can be managed under Settings → Privacy & security → Search.

Can I disable web suggestions in Windows Search?

The new Search settings include control over whether web and Microsoft Store suggestions appear alongside local results.

What is Administrator Protection?

Administrator Protection is a Windows security-hardening feature that keeps users deprivileged during ordinary activity and grants administrator privileges just in time when an administrative operation is explicitly authorized.

Is Administrator Protection enabled by default?

No. In the current rollout it is off by default.

Does Administrator Protection replace UAC?

It builds on Windows' administrative approval/elevation architecture rather than simply eliminating the need for UAC-style authorization. It introduces stronger isolation, temporary elevation and profile separation.

Does Administrator Protection require a restart?

Yes. Microsoft says a reboot is required for Administrator Protection to take effect after configuration.

What VPN improvement is included?

Windows improves resiliency and recovery from certain background VPN process-related conditions that could cause processes to stop responding.

What is ML-KEM?

ML-KEM is a post-quantum key encapsulation mechanism designed to help protect cryptographic key exchange against future quantum-computing threats.

Does Windows 11 now support post-quantum TLS?

Windows is progressively adding post-quantum cryptographic capabilities. With this update, ML-KEM can be used as a standalone algorithm for TLS key exchange in addition to previously added hybrid groups.

Is WMIC removed?

Yes. Beginning in August 2026, Windows 11 24H2 and 25H2 no longer include the legacy WMIC command-line utility, and it is no longer available as a Feature on Demand.

Is WMI also removed?

No.

WMIC and WMI are not the same thing.

The legacy WMIC command-line interface is removed, while Windows Management Instrumentation itself remains supported.

Are there known problems with KB5120998?

Yes. Microsoft currently documents issues including mouse customization resetting on some non-English Windows installations, Teams/new Outlook launch problems on some ARM devices, and desktop backgrounds/settings failing to load on some systems.

Should business users install the preview update immediately?

For production environments, it is generally better to test optional preview updates on a limited group of computers first. Organizations that prioritize stability can wait for the changes to progress through Microsoft's normal servicing cycle unless a particular fix is required.

FINAL RECOMMENDATION / CONCLUSION

KB5120998 is much more interesting than a routine Windows 11 maintenance update.

For everyday users, faster File Explorer Home, improved Search, automatic indexing of frequently used locations, smoother virtual desktops and improved touchpad/display behavior provide practical quality-of-life improvements.

For IT administrators, the update is more significant. Administrator Protection represents Microsoft's continuing move toward least-privilege Windows administration, while the complete removal of WMIC means organizations should review old scripts and management tools immediately.

The networking improvement is less visible but still valuable: Windows has improved recovery and resiliency around VPN background processes.

Perhaps the most important long-term development is cryptographic. Allowing ML-KEM as a standalone TLS key-exchange algorithm demonstrates that post-quantum cryptography is moving from research and experimentation into real Windows platform capabilities.

Microsoft's work on Execution Containers and agentic-process identification is equally worth watching because it shows Windows evolving to handle AI agents and machine-generated workloads as distinct security and identity scenarios.

However, KB5120998 remains an optional preview update, several headline features are being gradually enabled, and Microsoft has already documented known issues. Home users who value stability can wait for broader deployment, while IT departments should use this release as an opportunity to test application compatibility, Administrator Protection, WMIC replacements and upcoming Windows security changes before deploying them widely.

 

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