End of life doesn't mean the computers stop working. Your Windows 10 machines will turn on tomorrow morning, run your software, and seem completely fine. That's what makes this so easy to ignore — and so dangerous to ignore.
What ended on October 14, 2025 is Microsoft's commitment to fix anything that goes wrong with the operating system's security. Every vulnerability discovered from that date forward — and researchers find new ones every week — will never be patched on Windows 10. They just accumulate, permanently, on every machine you haven't upgraded.
What "End of Life" Actually Means
Microsoft releases security patches on the second Tuesday of every month — what the industry calls Patch Tuesday. For years, that cadence kept Windows machines reasonably protected: a vulnerability would be discovered, Microsoft would patch it, and the fix would roll out to all supported machines within weeks.
End of life means Windows 10 is off that list. Permanently. When the next Patch Tuesday comes around, Windows 11 machines get their fixes. Windows 10 machines get nothing. And the Tuesday after that. And every one after that.
Attackers monitor Microsoft's patch releases closely. When a fix drops for Windows 11, they reverse-engineer it to understand exactly what vulnerability was patched — and then target every unpatched machine they can find. Windows 10 machines will be on that list for every patch released from now on. The longer you wait, the larger that target list grows.
The Four Risks You Can't Ignore
Accumulating Vulnerabilities
Every unpatched CVE is a permanent open door. Security researchers find dozens of Windows vulnerabilities every month. On Windows 10, none of them close after October 2025 — they just stack up, and attackers know exactly which ones they are.
Cyber Insurance Denial
Most cyber insurance policies include language about maintaining supported, patched software. Running an EOL operating system is a documented exclusion in many policies. A ransomware claim on a Windows 10 machine could be denied outright — leaving you with the full recovery bill.
Compliance Violations
HIPAA, PCI-DSS, and most state-level data protection frameworks require systems to be kept patched and current. Running a known-unsupported OS on any system that touches regulated data is a compliance failure — not a technicality, but a real liability if you're ever audited or breached.
Software Dropping Support
Microsoft isn't the only one moving on. Browser vendors, antivirus providers, and line-of-business software makers are quietly dropping Windows 10 testing from their release cycles. Your software will keep running — until one day an update breaks something, and the vendor's answer is "upgrade your OS."
The Hardware Wall Nobody Warned Small Businesses About
Here's the part that catches most business owners off guard: upgrading to Windows 11 isn't always free, and it isn't always possible on the hardware you already own.
Windows 11 requires a processor feature called TPM 2.0 — a security chip that handles encryption and secure boot. Microsoft made this a hard requirement, not a suggestion. Machines without it cannot run Windows 11, no matter how capable they otherwise are.
Generally upgradeable
- Machines purchased 2020 or later
- Intel 8th gen (2018) or newer processors
- AMD Ryzen 2000 series or newer
- 4GB+ RAM, 64GB+ storage
- TPM 2.0 enabled in BIOS
Cannot run Windows 11
- Machines from 2017 or earlier
- Intel 6th or 7th gen processors
- Any machine without TPM 2.0
- 32-bit systems of any age
- Machines below 4GB RAM
A lot of perfectly functional office computers from the 2017–2019 era fall into the replacement column. They run fine today. They'll run fine tomorrow. But they cannot run Windows 11, which means the only path forward is new hardware — and that's the conversation most businesses have been putting off.
Every month you delay, you're running an increasingly vulnerable machine in your business. The cost of a hardware refresh is predictable. The cost of a breach — remediation, downtime, lost data, insurance deductibles, potential fines — is not. Most small businesses that get hit with ransomware spend more recovering than they would have spent replacing every computer in the building.
Recovering from ransomware costs far more than that.
What to Do Right Now
Find out which machines are affected
You may not know which computers in your office are running Windows 10 vs. Windows 11. On any Windows machine, press the Windows key, type "winver," and hit Enter — it tells you exactly what version you're on. Make a list. If you have more than a handful of machines, this is worth a systematic audit rather than checking one at a time.
Check which ones can upgrade for free
Microsoft's PC Health Check app (downloadable from microsoft.com) will scan a machine and tell you definitively whether it meets Windows 11 requirements. For machines that pass, the upgrade is free and can be done without reinstalling your software. For machines that fail, you now know they need to be replaced.
Plan the replacements — don't rush them
If you have five machines that need to be replaced, you don't have to do it all at once. Prioritize the ones that handle the most sensitive work: accounting, email, any system that touches client data or payment information. Those get replaced first. Less critical machines can follow in a second wave. A phased approach spreads the cost and avoids disruption.
Don't just swap the hardware — set it up right
A new Windows 11 machine out of the box is not a secure machine. BitLocker encryption, Windows Hello authentication, proper account setup, and connecting it to your Microsoft 365 tenant with the right Intune or Entra ID policies — that's what makes the hardware investment actually pay off from a security standpoint. New machines are an opportunity to do things right, not just to do things over.
If your business has any Windows 10 machines still running, that's not a future problem — it's a current one. The vulnerabilities are accumulating right now. Run the PC Health Check, make the list, and build a replacement plan. If you're not sure where to start or don't want to manage this yourself, that's exactly what MTDS is here for.
Not sure where your machines stand?
MTDS will audit every machine in your office, tell you which can be upgraded and which need to be replaced, and manage the whole transition — so you don't have to figure it out alone.
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