Short answer: Windows 10 reached end of support on October 14, 2025, so Microsoft no longer ships free security updates for it. To stay protected, upgrade eligible machines to Windows 11, enroll the ones you cannot upgrade yet in paid Extended Security Updates (ESU) as a temporary bridge, and keep every remaining Windows 10 device patched and visible until it is retired or replaced.
What "end of life" actually means
End of life, also called end of support, is the date after which a vendor stops maintaining a product. For Windows 10 that date was October 14, 2025. The machines did not stop working on that day, and they will not. What changed is that Microsoft stopped releasing the free monthly security updates that fix newly discovered flaws.
That distinction matters. A Windows 10 PC will still boot, run your line-of-business apps, and connect to the network for years. The problem is silent: every vulnerability disclosed after the end-of-support date stays open on that device forever, because no free patch is coming to close it.
The real risk of staying on unpatched Windows 10
Attackers actively watch end-of-life platforms. Once a product stops getting patches, any new vulnerability becomes a permanent, reliable target. The known-exploited record kept by CISA shows that flaws in widely deployed software get weaponized quickly, and an unpatched OS is the easiest kind of target to reuse.
The practical risks of running unpatched Windows 10 past end of support include:
- Permanent open vulnerabilities. New flaws never get a free fix, so the exposure only grows over time.
- Compliance gaps. Frameworks such as CIS Benchmarks, DISA STIG, and NIST expect supported, patched operating systems. An unsupported OS can put you out of compliance and complicate audits.
- Insurance and contract exposure. Many cyber-insurance policies and customer contracts require supported, patched systems.
- Loss of visibility. As fleets drift, teams lose track of exactly how many Windows 10 machines remain and where they are.
Your three practical options
Most teams will use a combination of all three of these, not just one.
- Upgrade to Windows 11 where hardware allows. This is the durable fix. Windows 11 has stricter hardware requirements, so check each device for eligibility before you schedule the upgrade.
- Enroll non-upgradeable machines in ESU. Extended Security Updates is Microsoft's paid program that keeps delivering critical and important security patches to Windows 10 after end of support. Treat it as a bridge that buys migration time, not a destination. It covers security fixes only.
- Retire or replace what you can. Some old hardware is cheaper to replace than to bridge. Identify devices that cannot run Windows 11 and are not worth an ESU subscription, and plan their replacement.
How to keep Windows 10 patched during the migration
A migration is rarely instant. You will run a mixed Windows 10 and Windows 11 fleet for months, and the Windows 10 machines still need care during that window. Three things keep you safe in the meantime:
- Know your count. Maintain an accurate, current inventory of which endpoints are still on Windows 10 so nothing slips through.
- Keep patching. Apply every available security update to the remaining Windows 10 devices, including any ESU-eligible patches once enrolled. Do not let "we are migrating anyway" become an excuse to stop patching.
- Patch the whole fleet together. Managing Windows 10 and Windows 11 in two separate tools creates blind spots. One console that covers both keeps the work consistent.
How TridentStack Control helps with Windows 10 end of life
TridentStack Control keeps a mixed Windows 10 and Windows 11 fleet patched from a single cloud console, with no on-premises patch server to maintain. One lightweight agent patches Windows, macOS, and Linux, plus third-party application updates, so the rest of your estate stays current while you finish the Windows 11 migration.
A single inventory view shows exactly which endpoints are still on Windows 10, so you always know how many remain and where they are. Built-in vulnerability detection flags open CVEs with CISA KEV context, and compliance scoring against CIS Benchmarks Level 1 and 2, DISA STIG, and NIST shows where an aging fleet is drifting out of policy.
Pricing is simple: the first 200 endpoints are free forever, then 5 dollars per endpoint per month, with every feature included and no feature tiers. Start free with TridentStack Control and get visibility into your remaining Windows 10 machines today.
FAQ
When did Windows 10 reach end of life?
Windows 10 reached end of support on October 14, 2025. After that date, Microsoft no longer ships free security updates for it unless the device is enrolled in the paid Extended Security Updates program.
Is it safe to keep using Windows 10 after end of life?
An unpatched Windows 10 device keeps working, but it stops receiving free security fixes, so any newly discovered vulnerability stays open permanently. The safest path is to upgrade to Windows 11 where hardware allows, and to enroll the machines you cannot upgrade yet in Extended Security Updates as a temporary bridge.
What are Windows 10 Extended Security Updates?
Extended Security Updates, or ESU, is a paid Microsoft program that delivers critical and important security patches to Windows 10 past its end-of-support date. It is a stopgap to buy migration time, not a permanent solution, and it covers security fixes only, not new features or general bug fixes.
How do I keep my remaining Windows 10 machines patched while I migrate to Windows 11?
Keep applying security updates to every Windows 10 device that is still in service, including any ESU-eligible patches, and keep an accurate inventory of which endpoints are still on Windows 10. A patch-management tool that covers Windows 10 and Windows 11 from one console lets you patch the mixed fleet and see your remaining Windows 10 count in one place.
Can I patch Windows 10 and Windows 11 from the same tool?
Yes. TridentStack Control patches Windows, macOS, and Linux from one cloud console, so a fleet running both Windows 10 and Windows 11 is managed together, and a single view shows which endpoints are still on Windows 10.