QUICK ANSWER

Windows Update does not deliver only one type of update. Microsoft releases several types of Windows updates for different purposes.

The two types most users see regularly are:

Monthly Security Update (Regular Cumulative Update) — Usually released on the second Tuesday of each month, commonly called Patch Tuesday. It contains security fixes, reliability improvements, and previously released fixes. For normal users and business computers, these updates should generally be installed.

Optional Non-Security Preview Update — Usually released on the fourth Tuesday of the month. It primarily gives users and IT administrators early access to non-security fixes, improvements, and sometimes new Windows features that are expected to become part of a later regular cumulative update. Installing it is normally optional.

Microsoft also releases annual feature updates, out-of-band (OOB) emergency updates, servicing improvements, driver updates, Microsoft Defender intelligence updates, .NET updates, and other component-specific updates.

A simple rule for most users is:

Install regular monthly security updates. You normally do not need to install Preview updates unless they fix a problem you are experiencing or you specifically want to test the upcoming changes.

COMPLETE ARTICLE

What Is Windows Update?

Windows Update is Microsoft's servicing system for delivering security patches, bug fixes, reliability improvements, drivers, Windows components, and new functionality to supported Windows devices.

Windows 11 and supported Windows versions use a largely cumulative servicing model. This means that the latest cumulative update normally contains the fixes included in previous cumulative updates as well as the newest changes.

Therefore, if you missed an earlier cumulative update, you generally do not have to manually install every missed monthly update one by one before installing the latest applicable cumulative update.

Microsoft describes Windows client updates as typically cumulative specifically to prevent systems from ending up with inconsistent combinations of fixes.

Main Types of Windows Updates

Microsoft's current Windows servicing model includes several important release types.

Update Type	Typical Schedule	Security Fixes	Optional?	Recommended for Normal Users?
Monthly Security Update	Second Tuesday	Yes	Generally No	Yes
Optional Non-Security Preview	Fourth Tuesday	Primarily previews non-security changes	Yes	Usually not necessary
Out-of-Band (OOB) Update	When required	Sometimes	Depends on release	Install when applicable/recommended
Annual Feature Update	Generally once per year	Includes servicing baseline/current fixes	Depends on rollout/policy	Yes, when appropriate and supported
Driver Update	As available	Not necessarily	Some are optional	Only when needed or offered normally
Defender Security Intelligence	Frequently	Malware definitions/protection	Automatic	Yes
.NET Updates	Periodically/monthly	Can include security fixes	Depends	Generally yes for security releases

Microsoft currently describes its main Windows client release cycle as monthly security releases, optional non-security preview releases, OOB releases, annual feature updates, and Windows 11 continuous innovation.

1. What Is the Regular Monthly Windows Security Update?

The regular Windows cumulative update is Microsoft's primary monthly Windows servicing release.

Microsoft normally publishes it on the second Tuesday of each month, typically at 10:00 AM Pacific Time.

This day is commonly known as:

• Patch Tuesday
• Update Tuesday
• B release
• B-week release
• Monthly security update
• Quality update
• Latest Cumulative Update (LCU)

These terms can sometimes cause confusion because different Microsoft documentation, administrators, and websites may use different names for essentially the same monthly servicing release.

What Does the Monthly Security Update Contain?

A monthly security update is cumulative and can contain:

• Newly released Windows security fixes
• Previously released security fixes
• Reliability improvements
• Bug fixes
• Quality improvements
• Non-security improvements previously released through an optional preview update
• Servicing-related improvements where applicable
• Previously released cumulative fixes

Microsoft explicitly states that the monthly security release includes both security and non-security content, including non-security content introduced in the previous optional preview release.

Should You Install Regular Monthly Security Updates?

Yes, in most cases.

These updates protect Windows against vulnerabilities and also contain reliability and quality improvements.

For:

• Home computers
• Office PCs
• Business laptops
• Workstations
• Managed corporate computers

the regular monthly security update should generally be considered an important part of maintaining Windows.

Organizations may test updates before broad deployment, but indefinitely avoiding security updates is normally a greater security risk than maintaining a controlled update process.

2. What Is a Windows Preview Update?

You may occasionally open Windows Update and see something similar to:

2026-xx Cumulative Update Preview for Windows 11 Version 25H2 for x64-based Systems (KBxxxxxxx)

The important word is:

Preview

This normally indicates an Optional Non-Security Preview Release.

Microsoft typically publishes these releases on the fourth Tuesday of the month.

They may also be called:

• Preview Update
• Cumulative Update Preview
• Preview CU
• LCU Preview
• Optional Preview Update
• D release
• D-week release

Microsoft describes these releases as optional cumulative non-security preview releases that allow administrators to validate upcoming changes before the following monthly security release.

Why Does Microsoft Release Preview Updates?

Suppose Microsoft has fixed problems involving:

• File Explorer
• Start menu
• Taskbar
• Windows Search
• Bluetooth
• Printers
• networking
• VPN
• authentication
• display behavior
• Windows Settings
• accessibility
• power management

Instead of waiting until the next Patch Tuesday to make every non-security fix available, Microsoft can release those improvements through an optional Preview update.

Users and administrators can install the preview release and validate those fixes.

The improvements can subsequently become part of a regular monthly cumulative security update.

Preview Does Not Mean Windows Insider Beta

This is an important distinction.

A Cumulative Update Preview offered through normal Windows servicing should not automatically be confused with a Windows Insider Dev, Beta, Canary, or Release Preview build.

The optional non-security preview is part of Microsoft's normal servicing process and is intended for early validation of production-quality changes.

It is still called "Preview" because the non-security changes are being made available before their broader inclusion in the next regular monthly security update.

Regular Update vs Preview Update

Here is the practical difference.

Regular Monthly Security Update	Optional Preview Update
Contains security fixes	Primarily previews non-security changes
Normally Patch Tuesday	Normally fourth Tuesday
Recommended for normal deployment	Optional
Security-focused servicing release	Early access/validation release
Includes previous applicable cumulative fixes	Cumulative
May automatically install depending on policy	Normally optional unless policies/settings allow otherwise
Appropriate for most PCs	More useful for testing or obtaining a specific fix early

Does a Preview Update Contain Only New Experimental Code?

No.

This is another common misunderstanding.

The optional preview is a cumulative update. It contains the applicable servicing baseline and introduces non-security fixes and improvements ahead of the next regular monthly security release.

It should therefore not be interpreted as a completely separate experimental version of Windows.

However, because its newest fixes have not yet gone through the following month's broad Patch Tuesday deployment cycle, conservative business environments may prefer to wait.

Do I Need to Install a Preview Update?

Usually, no.

For an ordinary Windows user whose computer is functioning normally, there is generally little reason to manually install every optional cumulative Preview update.

You can wait for the next regular monthly security update.

Many of the previewed non-security improvements will then be incorporated into the subsequent security update.

Example

Imagine Microsoft releases:

KB1234567 Preview

and it fixes:

• File Explorer freezing
• Taskbar responsiveness
• Bluetooth reconnection
• VPN reliability

Your PC does not suffer from any of these problems.

There is normally no urgent reason to install KB1234567.

You can wait for the following regular monthly update.

But if your PC has the File Explorer problem specifically fixed by that Preview update, installing it may be reasonable after checking Microsoft's documented known issues.

When Should You Consider Installing a Preview Update?

A Preview update can make sense when:

1. Microsoft documents that it fixes a problem affecting your computer.
2. You are an IT administrator testing next month's Windows changes.
3. A particular Windows bug is seriously affecting productivity.
4. You need a newly introduced improvement immediately.
5. You maintain test computers specifically for Windows update validation.
6. Microsoft support recommends that update for your particular issue.

For normal production computers that are functioning properly, waiting for the regular monthly update is generally the more conservative approach.

Should Businesses Install Preview Updates?

For most business production computers, not automatically across the entire organization.

A better deployment strategy is:

Test PCs → Pilot users → Production systems

An IT department might deliberately install optional preview releases on a small group of test computers.

For example:

IT Test Group

10 PCs receive Preview updates.

↓

Administrators monitor:

• application compatibility
• printing
• VPN
• network connectivity
• authentication
• File Explorer
• Start menu
• business applications

↓

If no major problems occur, administrators already have useful information before those changes become broadly available through a later regular security update.

This is one of the primary reasons Microsoft provides optional preview releases.

What Happens If I Skip the Preview Update?

Usually, nothing problematic.

Suppose:

August Preview Update

contains several non-security fixes.

You skip it.

Microsoft's September monthly security update can include those non-security improvements along with September's security fixes.

You normally do not need to install the August Preview first.

This is possible because Windows monthly servicing is cumulative.

What Does "Cumulative Update" Mean?

A cumulative update contains previous applicable fixes plus newer fixes.

For example:

January update:

A + B

February:

A + B + C + D

March:

A + B + C + D + E

If you missed February but install the applicable March cumulative update, the previous fixes are normally included.

This greatly simplifies Windows servicing.

Microsoft confirms that Windows client cumulative updates include previously released fixes.

What Is an LCU?

LCU means:

Latest Cumulative Update

The LCU contains cumulative Windows quality and security changes applicable to that Windows release.

You may encounter the term LCU in:

• Microsoft documentation
• DISM servicing procedures
• Microsoft Update Catalog
• enterprise deployment tools
• troubleshooting articles

What Is a Servicing Stack Update (SSU)?

The Servicing Stack is the Windows component responsible for installing and servicing Windows updates and other Windows components.

An SSU — Servicing Stack Update improves the reliability of that servicing mechanism.

In modern supported Windows servicing, Microsoft generally combines the servicing stack update with the cumulative update rather than requiring administrators to manually install separate SSUs each month.

Microsoft states that, starting with applicable Windows 10 releases in 2021, the latest SSU is combined with the cumulative update payload for Windows Update, WSUS, and Microsoft Update Catalog.

Therefore, instructions found on older websites saying that you must always manually download the SSU before installing the cumulative update may be outdated for modern Windows versions.

What Is an Out-of-Band (OOB) Windows Update?

An Out-of-Band update is released outside Microsoft's normal monthly schedule.

Microsoft uses OOB releases when an important problem cannot reasonably wait for the next scheduled update.

Examples might involve:

• serious Windows functionality failures
• widespread authentication problems
• major connectivity problems
• important security vulnerabilities
• problems caused by an earlier update

OOB updates are released as needed, rather than on a fixed Tuesday.

Microsoft states that OOB updates are cumulative and supersede prior applicable monthly security and optional preview releases. Some critical OOB releases can be distributed automatically, while noncritical OOB releases may be available only through Microsoft Update Catalog.

For example, Microsoft issued Windows 11 KB5085516 as an Out-of-Band cumulative update on March 21, 2026.

Should You Install an OOB Update?

Check why Microsoft released it.

If Microsoft released an OOB update specifically to resolve a critical problem affecting your Windows version or environment, installing it may be advisable.

Do not assume:

OOB = dangerous

or:

OOB = mandatory for every computer

Read the associated Microsoft KB article and Windows Release Health information first.

What Is a Windows Feature Update?

A Feature Update is significantly different from an ordinary monthly cumulative update.

Feature updates can move Windows to a newer release and introduce larger platform changes and functionality.

Microsoft currently uses an annual feature-update cadence for Windows clients, with feature updates generally released once per year in the second half of the calendar year.

Feature updates can include:

• new Windows functionality
• user-interface changes
• security improvements
• platform changes
• management improvements
• accessibility enhancements
• updated system components
• changes to deprecated or removed functionality

They also establish a new servicing lifecycle for that Windows release.

Feature Update vs Quality Update

These terms should not be confused.

Quality Update

Usually refers to servicing updates containing:

• security fixes
• bug fixes
• reliability improvements
• quality improvements

These occur regularly.

Feature Update

Moves the operating system to a newer Windows feature release and can introduce substantially broader functionality and platform changes.

What Is Windows 11 Continuous Innovation?

Windows 11 does not reserve every new feature for the annual feature update.

Microsoft also introduces selected Windows functionality periodically through its regular servicing technology.

A feature may first appear through an optional non-security preview update and then roll out more broadly through a subsequent monthly security update.

Microsoft calls this approach continuous innovation.

This explains why users sometimes notice new Windows features after installing an ordinary cumulative update rather than a major Windows version upgrade.

Why Can Two PCs with the Same Windows Version Look Different?

Microsoft can use gradual or controlled feature rollouts.

As a result, two computers may have:

• the same Windows edition
• the same Windows version
• the same cumulative update

but temporarily show slightly different functionality.

A feature can be gradually enabled instead of becoming available to every device simultaneously.

This does not necessarily indicate that Windows Update is malfunctioning.

What Is "Get the Latest Updates as Soon as They're Available"?

Windows 11 includes an option that can allow a device to receive eligible non-security improvements and feature rollouts sooner.

Users who prefer maximum stability rather than receiving new Windows functionality early may choose not to prioritize early delivery.

Business administrators can separately manage optional updates and controlled feature rollouts through Windows Update policies. Microsoft documents policy controls that determine whether managed devices receive optional non-security preview releases and controlled feature rollouts.

What Are Optional Driver Updates?

Windows Update may also display driver updates under optional updates.

These can include drivers for:

• graphics
• network adapters
• Wi-Fi
• Bluetooth
• monitors
• printers
• chipset components
• storage controllers
• audio devices
• firmware-related hardware components

Should You Install Every Optional Driver?

No.

If a device is working correctly, you generally do not need to manually install every optional driver simply because Windows Update lists it.

Consider an optional driver when:

• existing hardware is malfunctioning
• Device Manager reports a problem
• the driver addresses a known issue
• the PC/device manufacturer recommends it
• you need compatibility with a particular Windows release

For graphics, chipset, BIOS/UEFI, firmware, and specialized hardware, checking the computer or component manufacturer's support information can also be appropriate.

What Are Microsoft Defender Security Intelligence Updates?

Microsoft Defender Antivirus receives frequent security intelligence updates.

These contain information used to detect:

• malware
• viruses
• trojans
• ransomware
• potentially unwanted applications
• other threats

These updates are different from Windows cumulative updates and may be downloaded much more frequently.

They should normally be allowed to install.

What Are .NET Framework Updates?

Windows Update may separately offer updates for:

Microsoft .NET Framework

or newer Microsoft .NET components depending on the product and servicing channel.

These can contain:

• security fixes
• reliability fixes
• compatibility improvements
• runtime corrections

Security-related .NET updates should generally be treated with the same seriousness as other supported platform security updates.

What Are Checkpoint Cumulative Updates?

Beginning with Windows 11 version 24H2, Microsoft can periodically use checkpoint cumulative updates.

A checkpoint creates a servicing baseline. Subsequent cumulative update packages can use incremental binary differentials relative to that checkpoint.

For computers receiving updates normally through Windows Update or WSUS, Microsoft states that the process remains seamless and administrators generally do not need to change their normal update procedure.

The distinction is more relevant when manually obtaining and managing packages through Microsoft Update Catalog.

Can a Windows Update Cause Problems?

Yes.

Even thoroughly tested operating-system updates can occasionally cause compatibility or reliability problems on particular hardware or software configurations.

Possible symptoms include:

• boot problems
• application compatibility problems
• printer issues
• VPN failures
• network problems
• authentication problems
• performance degradation
• File Explorer problems
• driver conflicts
• Remote Desktop problems

This does not mean Windows updates should generally be disabled.

A safer strategy is:

Keep Windows patched + maintain backups + test important business systems + monitor documented known issues.

How to Check Whether a Windows Update Has Known Problems

Before deploying an update broadly across business systems, check:

1. The official Microsoft KB article for the update.
2. The Known issues section.
3. Windows Release Health.
4. Whether Microsoft has issued a Known Issue Rollback (KIR), workaround, or OOB fix.
5. Whether critical business applications have compatibility advisories.

Avoid relying solely on social-media posts claiming that an update is "broken." Determine whether Microsoft has documented the issue and whether it actually applies to your Windows version and environment.

How to Identify a Preview Update

Open:

Settings → Windows Update

Look at the update name.

If it contains:

Preview

such as:

Cumulative Update Preview for Windows 11...

it is normally an optional preview release.

Microsoft's KB pages also commonly place Preview in the update title. For example, Microsoft documented KB5077239 as a February 24, 2026 Preview release.

How to Check Installed Windows Updates

Open:

Settings → Windows Update → Update history

Here you can review categories such as:

• Quality Updates
• Driver Updates
• Definition Updates
• Other Updates

The exact interface and category names can vary with Windows version and servicing changes.

How to Check Windows Version and OS Build

Press:

Windows + R

Enter:

winver

Press Enter.

Windows will display information such as:

Version 25H2

and an:

OS Build

The OS build is especially useful when diagnosing whether a particular cumulative update has already been installed.

Check Installed Updates Using PowerShell

Administrators can also inspect installed hotfix information.

Open PowerShell and run:

Get-HotFix

To search for a particular KB:

Get-HotFix -Id KB1234567

Replace KB1234567 with the actual KB number.

Note: Get-HotFix does not represent every possible servicing component or update type, so Windows Update history, build information, DISM servicing information, and the Microsoft KB documentation may be needed for complete troubleshooting.

Check Windows Build from Command Prompt

Run:

winver

or:

systeminfo

You can also use:

DISM /Online /Get-Packages

The DISM command can produce a long list and is mainly useful for advanced troubleshooting.

Administrator rights may be required for some servicing commands.

Can You Uninstall a Problematic Windows Update?

Some Windows updates can be removed.

Go to:

Settings → Windows Update → Update history → Uninstall updates

Select the applicable update if Windows permits removal.

However, uninstalling a security update removes its security fixes as well.

Therefore, uninstalling should generally be considered when:

• a confirmed update causes a serious problem
• Microsoft recommends removal as a workaround
• business-critical software stops functioning
• another supported mitigation is unavailable

Before uninstalling updates from critical systems, maintain a current backup or recovery plan.

Should You Pause Windows Updates?

Temporarily pausing updates can be useful while investigating a documented compatibility problem.

Permanently disabling Windows Update is generally not recommended.

A better approach is:

Pause → investigate → resolve/test → resume updating

rather than disabling updates indefinitely.

Recommended Windows Update Strategy for Home Users

For a normal home computer:

Regular security cumulative update: Install

Microsoft Defender updates: Install

Security-related .NET updates: Install

Preview cumulative update: Usually wait

Optional driver: Install only when needed

Feature update: Install when appropriate for your supported device, preferably after checking compatibility and having a backup

OOB update: Check Microsoft's reason for release and install when applicable

Recommended Strategy for Business Computers

Businesses should consider a controlled deployment process:

Microsoft releases update

↓

Review KB article and known issues

↓

Deploy to IT/test machines

↓

Deploy to small pilot group

↓

Monitor applications, printing, VPN, authentication and hardware

↓

Deploy broadly

For servers and business-critical workstations, this approach can reduce disruption while avoiding the security risks associated with leaving systems unpatched for extended periods.

Which Updates Should I Normally Install?

Update	General Recommendation
Monthly Security Cumulative Update	Install
Defender Security Intelligence	Install
Security .NET Update	Install
Optional Preview CU	Usually wait unless needed
Optional Driver	Install only when needed
Feature Update	Install after compatibility/readiness check
OOB Update	Evaluate reason; install when applicable
Firmware/BIOS through Windows Update	Review device/manufacturer guidance

Important: "Optional" Does Not Mean "Bad"

Some users see the word Optional or Preview and assume the update is unsafe.

That is not accurate.

Optional means that the update is not required as part of the normal monthly security deployment at that point.

A Preview update can contain valuable fixes.

The practical question is not:

"Is a Preview update bad?"

The better question is:

"Do I need the fixes in this Preview update now, or can I wait until they are incorporated into the normal servicing cycle?"

For most users with a properly functioning computer, waiting is perfectly reasonable.

Important: "Regular Update" Does Not Mean Risk-Free

Likewise, a Patch Tuesday security update is not guaranteed to work perfectly on every possible combination of:

• hardware
• drivers
• applications
• security products
• VPN clients
• business software
• peripherals

Regular updates receive broad testing, but compatibility problems can still occur.

This is why business environments should combine timely patching with staged deployment and backups.

Understanding Microsoft's Monthly Update Cycle

A simplified monthly servicing cycle looks like this:

Fourth Tuesday of Month 1

Optional Non-Security Preview

↓

Early availability of fixes and selected improvements

↓

Second Tuesday of Month 2

Monthly Security Update / Patch Tuesday

↓

Security fixes + applicable previous non-security improvements + cumulative fixes

↓

Fourth Tuesday of Month 2

Next Optional Non-Security Preview

↓

Cycle continues

This is the key relationship between Preview and regular Windows cumulative updates.

FAQ

Is Windows Cumulative Update Preview mandatory?

No. Microsoft's non-security Preview cumulative releases are normally optional. They are designed to make upcoming non-security fixes and improvements available before the next monthly security release.

Should I install Windows Preview updates?

If your PC works normally, you usually do not need to install every Preview update. Consider one if it fixes a problem affecting your system or if you intentionally want to test upcoming Windows changes.

Will I lose the Preview fixes if I don't install the Preview update?

Normally no. Applicable non-security improvements from a Preview release can subsequently be included in a regular monthly security cumulative update.

Is a Preview cumulative update the same as Windows Insider?

No. An optional non-security Preview cumulative update is part of normal Windows servicing. Windows Insider is a separate preview program for testing Windows builds and features.

What is Patch Tuesday?

Patch Tuesday is the common name for Microsoft's regular monthly security update release, normally published on the second Tuesday of each month.

What is a B release?

"B release" or "B-week release" is another term for Microsoft's second-Tuesday monthly security update.

What is a D release?

The optional non-security Preview release is commonly referred to as a D-week release because it is typically released during the fourth week of the month.

What is an OOB update?

OOB means Out-of-Band. It is an update Microsoft releases outside the normal monthly schedule to address an issue or vulnerability that should not wait for the next scheduled release.

Are Windows updates cumulative?

Most modern Windows quality updates are cumulative. The latest applicable cumulative update includes previously released fixes in addition to newer changes.

Do I have to install every missed Windows cumulative update?

Normally no. Because cumulative updates contain previous applicable fixes, installing the latest applicable update generally brings the system forward without manually installing each previous monthly CU.

Should I disable Windows Update permanently?

Generally no. Permanently disabling Windows Update leaves the computer exposed to vulnerabilities and prevents important reliability fixes from being delivered.

Should servers install Preview updates?

Production servers and business-critical systems should generally follow a controlled patch-management policy. Optional preview releases should normally be evaluated and tested rather than deployed automatically simply because they are available.

Are optional driver updates necessary?

Not necessarily. If hardware works correctly, there is usually no need to install every optional driver. Install one when it addresses a specific problem, compatibility requirement, or manufacturer recommendation.

How can I check which Windows update is installed?

Go to:

Settings → Windows Update → Update history

You can also run winver to check your Windows version and OS build.

Can I uninstall a Windows update if it creates a problem?

Some updates can be uninstalled through:

Settings → Windows Update → Update history → Uninstall updates

However, removing a security update also removes its security protection, so uninstall only when justified and preferably after confirming the problem.

Why did I receive a new Windows feature without installing a feature update?

Windows 11 uses continuous innovation. Microsoft can introduce selected features through the normal servicing process, sometimes beginning with an optional preview and later rolling them into regular monthly servicing.

What are checkpoint cumulative updates?

Starting with Windows 11 version 24H2, Microsoft can periodically create checkpoint cumulative updates that serve as servicing baselines for subsequent incremental update packages. Normal Windows Update and WSUS users generally do not need to change how they install monthly updates.

FINAL RECOMMENDATION / CONCLUSION

The most important distinction is simple:

Regular Monthly Security Update = normally install it.

Optional Non-Security Preview Update = normally wait unless you need a particular fix or want to test upcoming changes.

Preview updates are not inherently bad or unstable beta versions. They are Microsoft's mechanism for making upcoming non-security fixes and improvements available early for validation.

For home users, allowing normal security updates while being selective about optional Preview and driver updates provides a sensible balance between security and stability.

For businesses, servers, RDP environments, and systems running critical accounting, ERP, VPN, printing, or line-of-business applications, use a staged update strategy:

Review → Backup → Test → Pilot → Deploy → Monitor

Do not permanently disable Windows Update merely because occasional updates have known issues. Instead, check Microsoft's KB documentation and Windows Release Health, maintain reliable backups, and use controlled deployment.

Microsoft's servicing model changes over time, so update classifications, schedules, and Windows Update interface options should always be verified against current Microsoft documentation when making enterprise deployment decisions.

 

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