Windows 10 End of Life: What Small Business Owners Need to Do Now
On October 14, 2025, Microsoft ended mainstream support for Windows 10. That means no more security patches. No more bug fixes. No more vulnerability updates.
If your business is still running Windows 10 — and a large percentage of small businesses are — you’re not getting kicked off your computer tomorrow. It will still boot. Email will still open. QuickBooks will still run.
But every day that passes without patches, the attack surface grows. Hackers know exactly when Microsoft stops shipping updates. They actively hunt for newly discovered Windows 10 vulnerabilities that will never be fixed. And those vulnerabilities will exist forever now.
This post explains what Windows 10 end of life actually means, what your real options are, and how to decide which path is right for your business.
What “End of Life” Actually Means
Microsoft divides its support lifecycle into two phases:
Mainstream Support — the full-service phase. Includes security patches, bug fixes, feature updates, and free technical support from Microsoft.
Extended Support — the wind-down phase. Security patches only, no new features, limited free support.
End of Life — everything stops. No more patches of any kind, including security updates.
Windows 10 hit End of Life on October 14, 2025. It’s now in the “no patches, no fixes, no nothing” category.
The last version of Windows 10 (22H2) reached its final security update in October 2025. From that point forward, any new vulnerability discovered in Windows 10 — and new ones get discovered every month — will never be patched by Microsoft.
For home users, this is a nuisance. For businesses that handle customer data, financial records, health information, or that are subject to compliance requirements, this is a liability.
How Many Businesses Are Still on Windows 10?
More than you’d expect.
According to StatCounter, as of mid-2026, Windows 10 still represents a significant portion of active Windows installations globally. Many of those are in business environments — particularly small and mid-sized businesses that delayed the migration due to cost, hardware compatibility issues, or simply not making it a priority.
If you manage a team of 10–50 people in Fort Wayne or San Diego, there’s a real chance you have at least a handful of machines still on Windows 10. If your IT was handled reactively — meaning you only called someone when something broke — that number could be higher. That is one reason many businesses eventually compare break-fix vs. managed IT services before a deadline forces the decision.
Why Running Windows 10 Now Is Different Than Running It Two Years Ago
In 2023 and 2024, running Windows 10 was fine. Microsoft was actively patching it. Vulnerabilities got fixed. Your risk profile was manageable.
In 2026, running Windows 10 means you’re on an unpatched operating system with a growing backlog of known, publicly disclosed vulnerabilities — none of which will ever be fixed.
Here’s what that creates:
A permanent attack surface. Every CVE (Common Vulnerabilities and Exposures) disclosed against Windows 10 from October 2025 onward will sit unpatched on your machine indefinitely. These get indexed by threat actors and automated scanning tools.
Compliance exposure. If your business is subject to HIPAA, PCI DSS, SOC 2, NIST 800-171, or CMMC requirements, running an unpatched, EOL operating system is a direct control failure. Auditors and assessors will flag it.
Cyber insurance risk. Insurers have tightened their underwriting requirements significantly in the past three years. Running EOL software — particularly the OS — is one of the clearest disqualifying factors on a renewal questionnaire. If you have a claim and your insurer’s forensics team finds your breach started on a Windows 10 machine that hadn’t been patched in 18 months, you may be looking at a denied claim. If renewal is coming up, review our cyber insurance audit prep guide before you answer the EOL software questions.
Vendor support drop-off. As Windows 10 ages past EOL, software vendors will start dropping support. You may find that future versions of your accounting software, EHR, or line-of-business application require Windows 11 or higher to run properly.
Your Three Options
If you have Windows 10 machines in your business right now, you have three paths:
Option 1: Upgrade to Windows 11 (The Right Move for Most Businesses)
Windows 11 is the direct successor to Windows 10 and Microsoft’s current supported OS. If your hardware supports it, upgrading is the cleanest solution.
The catch: Windows 11 has stricter hardware requirements than Windows 10. The key requirements:
- 64-bit processor, 1GHz+, 2+ cores (most modern processors qualify)
- 4GB RAM minimum (16GB recommended for business use)
- 64GB storage (more is always better)
- UEFI firmware with Secure Boot capable (most systems from 2015+ support this)
- TPM 2.0 (Trusted Platform Module) — this is where many older machines fail
The TPM 2.0 requirement is the most common blocker for older hardware. Many machines from 2015–2018 either have TPM 1.2 (not enough) or no TPM chip at all.
Before committing to upgrades, the first step is a hardware compatibility audit. Run the Windows 11 PC Health Check tool on each machine to see which ones can upgrade in place and which ones need to be replaced.
Cost estimate for a business upgrade: If hardware is compatible, an in-place OS upgrade costs mostly time — internal IT time or MSP managed migration time. If you’re paying an IT provider, budget 1–2 hours per machine for assessment, staging, data backup, upgrade, and post-upgrade testing. For 10 machines, that’s roughly $500–$1,500 depending on your provider’s rates and how much standardization you’ve already done. For broader planning, see our breakdown of managed IT services cost in 2026.
Option 2: Replace Aging Hardware
If a significant portion of your fleet fails the Windows 11 compatibility check, it may be more cost-effective to replace the machines than to try to retrofit them.
Cost estimate: A business-class Windows 11 machine (Dell OptiPlex or HP EliteDesk range) runs $500–$900 per unit for a desktop, $700–$1,200 for a laptop. For a 10-person team where 5 machines need replacement, you’re looking at $3,500–$6,000 in hardware.
That sounds like a lot until you compare it to the cost of a single ransomware incident. The FBI’s 2024 IC3 report put the average ransomware cost for small businesses at over $300,000 when you factor in downtime, recovery, and remediation. Even a non-ransomware outage can be expensive; our IT downtime cost guide shows how quickly a few hours of disruption turns into real business loss.
The smart move: Use an EOL migration as an opportunity to standardize your hardware fleet. A mixed environment of different machine ages and configs creates IT complexity and higher support costs over time. A refresh cycle gets you to a uniform, supported baseline.
Option 3: Extended Security Updates (ESU) — A Paid Stopgap
Microsoft offers a paid Extended Security Updates (ESU) program for Windows 10 that provides additional security patches beyond the October 2025 EOL date. This was originally a program for enterprise customers but was made available to small businesses.
Year 1 (through Oct 2026): $30/device Year 2 (through Oct 2027): $60/device Year 3 (through Oct 2028): $120/device
ESU covers security patches only. It does not add new features, fix compatibility issues, or change the trajectory of Windows 10 as a retiring platform.
When ESU makes sense: If you have a handful of specialized machines running legacy software or equipment that won’t run on Windows 11 (think a machine attached to specialized manufacturing equipment or an older medical device), ESU buys you time to plan a proper replacement rather than scrambling. It’s a bridge, not a destination.
When ESU doesn’t make sense: If ESU is just a way to avoid making a decision, the math doesn’t work. Year 1 + Year 2 + Year 3 costs more than replacing the machine, and you’re still on an aging platform with no future.
What a Business Migration Actually Looks Like
If you have a managed IT provider (or you’re evaluating one), here’s the realistic migration process for a small business:
Step 1: Hardware Audit (Week 1) Run compatibility checks on every machine. Sort into three buckets: can upgrade in place, needs hardware replacement, edge cases requiring investigation (often specialized equipment or legacy line-of-business apps).
Step 2: Compatibility Testing (Weeks 1–2) Before upgrading production machines, test your critical applications on Windows 11. Most modern software works fine, but this step catches the exceptions — and it’s much better to find incompatibilities in staging than after upgrading the whole fleet.
Step 3: Backup and Stage (Week 2) Before touching any machine, verify backups are current and restorable. Then stage the upgrades on a test machine to confirm the upgrade process and confirm applications are stable.
Step 4: Phased Rollout (Weeks 2–4) Don’t upgrade everything at once. Migrate machines in phases — typically by department or role. Users on upgraded machines can continue working while the rest of the fleet migrates.
Step 5: Post-Migration Validation (Week 4) Confirm all machines are running Windows 11, verify patches are applying correctly, validate that all applications function, and remove any ESU licensing if it was deployed as a stopgap.
A clean migration for a 10–25 person business typically takes 2–4 weeks with an active IT provider involved. For businesses that have been reactive with their IT, add time for the cleanup that happens when you dig into a deferred fleet.
The Compliance and Insurance Angle
If you’re already in conversations about cyber insurance renewal or if your business is subject to any compliance framework, your EOL situation needs to be part of the conversation.
HIPAA: The HIPAA Security Rule requires “technical safeguards” to protect ePHI. Running an unpatched EOL operating system on any device that handles ePHI is a clear gap. Auditors and assessors will flag it.
CMMC: If you’re a Department of Defense contractor or subcontractor working toward CMMC Level 2, unpatched/EOL systems are explicitly covered under NIST 800-171 control 3.14.1 (identify, report, and correct information system flaws). Running Windows 10 past EOL without ESU or a documented exception will fail that control. We covered the broader requirements in our guide to CMMC 2.0 compliance for small manufacturers.
Cyber Insurance: Most current cyber insurance applications include a question about whether you’re running EOL software on your network. Answering truthfully with “yes, we have Windows 10 machines” will either result in a premium increase, a coverage exclusion, or a denied application depending on your insurer. If you answer “no” and have a claim, you’re potentially voiding coverage through misrepresentation.
For Fort Wayne and San Diego Businesses Specifically
In Fort Wayne, we see this most often in manufacturing, professional services (legal, accounting, engineering), and healthcare-adjacent businesses — sectors that have historically run IT reactively. Equipment that “still works” doesn’t get touched, which means OS upgrades get deferred.
The problem is that “still works” and “still secure” are not the same thing after October 2025.
In San Diego, we see similar patterns in small professional services firms and the tech-adjacent small business community — places where someone set up the IT environment years ago and it’s been largely left alone.
If you don’t know what percentage of your fleet is still on Windows 10, that’s the first thing to find out. It’s a five-minute check if you have RMM visibility, or a half-day audit if you don’t.
5 Questions to Ask Your IT Provider About Windows 10 EOL
If you have an IT provider and haven’t had this conversation yet, here’s what to ask:
“Can you show me exactly how many machines in our environment are still on Windows 10?” — If they can’t answer this in under 24 hours, they don’t have adequate visibility into your environment.
“Which of those machines are compatible with Windows 11 and which need hardware replacement?” — This tells you the scope and cost of the project.
“Do we have any machines on ESU? If so, how long will that cover us?” — ESU is a valid stopgap; you should know if it’s been deployed and when it expires.
“Do any of our critical applications have Windows 11 compatibility issues?” — A good IT provider will have already checked this. If they haven’t, it’s a red flag.
“What’s your recommended timeline and project plan to get us fully off Windows 10?” — You should have a specific date, not “we’ll get to it.”
FAQ
Q: Is Windows 10 completely dead? Can I still use it? A: Windows 10 still runs — Microsoft hasn’t remotely disabled anything. But it’s no longer receiving security patches, which means known vulnerabilities will never be fixed. Using it in a business environment creates security and compliance risk that grows over time.
Q: What’s the difference between Windows 10 end of support and end of life? A: In Microsoft’s terminology, “end of support” and “end of life” both refer to the same milestone for Windows 10 — the point (October 14, 2025) where Microsoft stopped all security patches and updates. Some vendors use the terms interchangeably.
Q: My computer won’t upgrade to Windows 11. What are my options? A: You have two main options: purchase a new machine that meets Windows 11’s hardware requirements, or enroll the current machine in Microsoft’s Extended Security Updates (ESU) program as a bridge while you plan replacement. ESU costs $30/device/year for the first year.
Q: Does running Windows 10 automatically void my cyber insurance? A: Not automatically, but it’s a real risk. If you’re renewing and your application asks about EOL software, you need to answer truthfully. If you have a claim and forensics reveals the breach originated on an unpatched EOL machine, your insurer may dispute or deny coverage.
Q: How long does a Windows 10 to Windows 11 migration take for a small business? A: For a typical 10–25 person business with an active IT provider, a phased migration takes 2–4 weeks. This includes hardware audits, application compatibility testing, backups, the actual upgrades, and post-migration validation. Rushing it without testing is how you create problems.
Q: Does my IT support provider cover Windows 11 migration, or is it extra? A: It depends on your agreement. Most managed IT agreements cover OS upgrades as part of ongoing maintenance for compatible hardware. Hardware replacement (if machines can’t upgrade) is typically a separate project cost. Ask your provider specifically — and if they don’t have a clear answer, that’s worth paying attention to.
The Bottom Line
Windows 10 end of life isn’t a countdown that’s still ticking — it already ticked. October 14, 2025 is in the rearview mirror. Every day your business runs an unpatched EOL operating system, the risk grows slightly larger. Threat actors accumulate more Windows 10-specific CVEs with no patch to remediate them.
The good news: this is a solvable problem. Most businesses can be fully off Windows 10 within 30–60 days with a clear plan and an IT provider who knows what they’re doing.
If you’re in Fort Wayne, Indiana or San Diego, California, SDTEK can run a no-obligation assessment of your environment — identify how many machines are affected, which can upgrade in place, which need replacement, and what your fastest path to a fully supported fleet looks like.
Get a free Windows 10 EOL assessment →