Microsoft will end security updates for Windows 11 version 24H2 on Home and Pro editions on October 13, 2026, leaving less than three months for users to move to a supported release. The same date also marks the expiration of the Windows 10 Extended Security Updates program, creating a simultaneous deadline for both Windows 11 laggards and Windows 10 holdouts. Ignoring the cutoff means forfeiting monthly patches that fix newly discovered vulnerabilities, silently increasing the risk to your personal data and online accounts.
The October 13, 2026 Deadline: Who’s Affected
Windows 11 version 24H2, first released on October 1, 2024, follows a fixed servicing lifecycle. Home and Pro editions receive 24 months of support from general availability, while Enterprise and Education editions get 36 months. That means the clock runs out for most consumers and small businesses on October 13, 2026. After that date, Microsoft will no longer deliver monthly cumulative security updates, and any newly patched flaws in supported Windows versions will remain unaddressed on 24H2 Home and Pro devices.
Enterprise and Education users of 24H2 have more breathing room—their support extends until October 12, 2027. But for the millions of unmanaged PCs running 24H2 Home or Pro, the countdown is real. The same version number has two drastically different expiration dates depending on edition, a nuance that often catches users off guard.
What Support Actually Ends
The end of servicing does not mean your PC will stop working, lock you out, or suddenly become useless. Apps continue to launch, files remain accessible, and nothing visibly changes on October 14. What stops is the regular flow of security fixes Microsoft releases every second Tuesday of the month.
These updates close vulnerabilities in the Windows kernel, networking stack, browser components, and other critical services. Once a version is unsupported, attackers can reverse-engineer patches released for newer versions and target the same weaknesses in older, unprotected code. Over time, the gap between your system and the actively defended ecosystem widens. Antivirus software cannot compensate for an unpatched operating system—it can block malware but not repair a flaw in Windows itself.
The risk grows gradually, not explosively. But every month adds new, unfixed holes. Connecting an unsupported PC to a home network, handling sensitive documents, or simply using a modern browser all become riskier without those under-the-hood defenses.
Why So Many Versions, and Why Such Short Lifecycles?
Windows 11 moved to an annual feature-update cadence after Windows 10’s twice-yearly rhythm. Each release—such as 23H2, 24H2, and 25H2—gets its own servicing timeline. Microsoft shifted away from the old model where a single Windows version (like Windows 7) received a decade of patches. Today, the company wants to concentrate engineering effort on a smaller number of actively maintained branches, retire outdated code faster, and speed up security improvements.
That approach means simply running “Windows 11” is no guarantee of support. You must know your exact edition and version. Home and Pro editions get only two years per release; Enterprise and Education get three. That difference explains why some PCs need an upgrade sooner than others, even if both show “24H2.”
Windows 11 version 23H2 Home and Pro already lost support on November 11, 2025. Its Enterprise and Education counterparts will continue receiving updates until November 10, 2026. Knowing your edition is essential.
The Overlap with Windows 10’s Final Countdown
Complicating matters further, the October 13, 2026 date also marks the end of the consumer Extended Security Updates (ESU) program for Windows 10. Microsoft ended mainstream support for Windows 10 on October 14, 2025, but offered a one-year ESU bridge to give users more time. That bridge expires the same day 24H2 Home and Pro support ends.
So, if you’re still on Windows 10 and relying on ESU, or if you’re on Windows 11 24H2 Home/Pro, you face the same deadline. The convergence means millions of PCs will need to move to a fully supported platform—or accept the risks of running without patches.
A Quicker Upgrade: What to Do Now
For most people, the path forward is straightforward: upgrade to Windows 11 version 25H2. Released on September 30, 2025, version 25H2 is the natural successor to 24H2 and will receive updates until October 12, 2027 for Home and Pro, and until October 10, 2028 for Enterprise and Education. It usually appears as an optional download in Windows Update when you click “Check for updates,” though Microsoft stages rollouts to avoid problems.
If you don’t see it, several factors could be at play:
- Safeguard holds: Microsoft may temporarily block the upgrade on devices with known compatibility issues—faulty drivers, specific apps, or hardware configurations. Do not bypass these holds unless you understand the underlying problem and have a full backup.
- Low disk space: Feature updates need several gigabytes of free space. Clear temporary files or move large media to an external drive.
- Missing prerequisite updates: Make sure your current 24H2 installation is fully patched. Install any pending quality updates, restart, and check again.
- Administrative policies: On work-managed PCs, your IT department may control when upgrades deploy. Contact them if you’re unsure.
You can also trigger an upgrade manually using the Windows 11 Installation Assistant or the Media Creation Tool from Microsoft’s website. This method skips some of the gradual rollout logic but should still be used with caution—backup your data first, and ensure your hardware meets Windows 11’s requirements.
For Windows 10 users on ESU, the choice is starker. You need to migrate to Windows 11 on compatible hardware, or consider alternatives. The PC Health Check app can assess compatibility. If your device doesn’t qualify, repurposing it with a lightweight Linux distribution, or trading it in for a newer machine, become practical options.
Checking Your Version and Deadline in 30 Seconds
Open the Run dialog (Windows key + R), type winver, and press Enter. A window will display your exact edition (Home, Pro, etc.) and version (23H2, 24H2, 25H2). Write both down. Then, head to Microsoft’s official Windows release information page and match your edition and version to its official end-of-support date. Do not trust a single forum post or outdated article—Microsoft’s lifecycle table is the authoritative source.
If your version is already unsupported (e.g., 23H2 Home/Pro), update immediately. If you’re on 24H2 Home/Pro, you have until October 13, 2026, but upgrading now removes deadline pressure and gives you the latest security enhancements.
What About the Mysterious Version 26H1?
You might see references to Windows 11 version 26H1, released on February 10, 2026. This version is not intended as an upgrade for existing 24H2 or 25H2 PCs. According to Microsoft’s documentation, it’s scoped for new devices that shipped with updated platform requirements. It will not appear as an automatic update on your current machine, and you should not seek it out unless you know your PC requires it. For the vast majority of users, 25H2 is the correct target.
Preparing for a Smooth Upgrade
A feature update can fail or cause headaches if you rush. These steps minimize disruption:
- Back up irreplaceable files. Use an external drive, cloud storage, or both. A backup protects you from far more than just a bad update.
- Free up disk space. Clear temporary files, remove unused apps, and check your Downloads folder.
- Update all drivers. Visit your PC manufacturer’s site for the latest graphics, network, and chipset drivers.
- Uninstall unnecessary third-party security software. Some antivirus or firewall tools can block the upgrade; you can reinstall them afterward.
- Check for pending restarts. Windows Update sometimes waits for a reboot before offering the next version.
- Temporarily disconnect unnecessary peripherals. USB hubs, external hard drives, or specialty devices can confuse the installer.
After the upgrade, run Windows Update again to snag the latest cumulative fixes for 25H2. Then, set a calendar reminder to check your version every six months—this habit prevents future surprises.
The Business Dimension: Inventory and Planning
For IT administrators, the deadline is an audit trigger. Unsupported Windows versions on employee machines can violate compliance policies, break cyber insurance requirements, and expose the organization to audits. A robust endpoint inventory that tracks edition, version, build number, and hardware readiness is essential. Staged deployment rings—starting with IT, then early adopters, then broad rollout—allow validation of critical line-of-business apps before the entire fleet moves.
Enterprises should already be monitoring 24H2 endpoints and pushing 25H2. If any devices remain stubbornly on 24H2 after October 13, they must have a documented exception, compensating controls, and a retirement date. LTSC and IoT editions follow separate, longer lifecycles but serve specialized use cases; they are not a panacea for avoiding regular version upgrades.
Outlook: The Next Cycle Begins
Once 24H2 Home and Pro exit support, attention will shift immediately to Windows 11 version 26H2, expected in late 2026. That release will likely become the next standard upgrade target, with its own 24-month countdown. For now, the priority is getting to 25H2. Microsoft is expected to intensify automatic rollouts for eligible 24H2 machines as the deadline approaches, but waiting for the last minute risks a bumpy experience. Test your hardware and software compatibility now, while there’s still time to troubleshoot.
An unsupported Windows PC isn’t a ticking bomb—but it is a growing liability. Checking your version takes less than a minute. Upgrading takes an hour or two. The alternative is months or years of unpatched vulnerabilities that no firewall or antivirus can fully erase. Mark October 13, 2026 on your calendar, and then make it a non-issue by updating today.