Why Windows 10 end of life matters

For most businesses, the problem is not that Windows 10 suddenly stops working. The bigger risk is that unsupported systems become harder to defend over time.

When an operating system stops receiving regular security updates, newly discovered vulnerabilities may remain unpatched. That creates a growing gap between the threats your business faces and the protection your devices can realistically maintain.

Operating system patching is a core cyber security control. The Australian Signals Directorate includes patching operating systems in its Essential Eight guidance, and its broader patching advice sets timeframes for operating systems depending on exposure and threat level.

For businesses handling sensitive data, financial records, client information, health information or regulated workloads, unsupported endpoints can also create uncomfortable questions around cyber insurance, supplier assurance, privacy obligations and incident response.

What changed after 14 October 2025?

Microsoft’s lifecycle information confirms that Windows 10 reached end of support on 14 October 2025 and that Windows 10 version 22H2 is the final version for standard Windows 10 releases. Microsoft’s Windows release health information also states that the October 2025 monthly security update was the final update for the last supported Windows 10 versions.

In practical terms, standard Windows 10 business devices should now be treated as end-of-life unless they are covered by Extended Security Updates or a separate lifecycle such as a qualifying LTSC release.

The risks of keeping Windows 10 in production

Unsupported Windows 10 devices can create risk across security, compliance, user productivity and recovery planning.

• Security exposure: New vulnerabilities may be discovered after the support period, but standard Windows 10 devices will no longer receive normal fixes.
• Insurance and compliance pressure: Insurers, clients and auditors may ask whether unsupported operating systems are present in your environment.
• Vendor support gaps: Line-of-business applications, endpoint security tools, drivers and management platforms may gradually reduce support for Windows 10.
• Incident response complexity: If a compromised device is running an unsupported operating system, containment and recovery can become slower and more expensive.
• Productivity issues: Microsoft 365 apps and third-party software may keep running for a time, but reliability and compatibility issues can become more common.

Your options at a glance

Is Windows 10 Extended Security Updates enough?

Windows 10 Extended Security Updates, or ESU, can reduce risk while you complete a transition, but it should not be treated as a permanent strategy.

For commercial organisations, Microsoft describes Windows 10 ESU as a paid annual subscription for enrolled PCs. Microsoft says ESU includes critical and important security updates, but does not include new features, customer-requested non-security updates or general technical support.

Microsoft lists commercial Windows 10 ESU at US$61 per device for Year One, with pricing doubling each consecutive year for a maximum of three years. That makes ESU useful as a bridge, not a comfortable place to stay.

Will Microsoft 365 still work on Windows 10?

Microsoft 365 apps such as Word, Excel, Outlook and Teams may continue to run on Windows 10, but that does not make the underlying Windows 10 operating system supported.

Microsoft says Microsoft 365 Apps on Windows 10 will receive feature updates and eligible Copilot support until Version 2608, then remain on that version with security updates only until 10 October 2028.

The key distinction is simple: Microsoft 365 app security updates are not the same as Windows 10 operating system support. A business device can have updated Office apps while still running an unsupported OS.

Can every Windows 10 device upgrade to Windows 11?

No. Some Windows 10 devices will not meet Windows 11 requirements.

Microsoft’s Windows 11 requirements include a supported processor, 4 GB RAM, 64 GB storage, UEFI with Secure Boot capability, TPM 2.0, compatible graphics and other requirements. Microsoft also provides PC Health Check and Windows Update eligibility checks to help determine whether a device can upgrade.

For business environments, eligibility should not be left to individual staff members. It should be handled through an IT audit and technology assessment or endpoint management review so leadership can see the full picture.

A practical Windows 10 migration plan

The safest path is to treat Windows 10 end of life as a business risk project, not just a technical upgrade.

1. Audit every device

   Identify every Windows 10 endpoint, including laptops, desktops, shared workstations, reception PCs, warehouse devices, meeting room machines and rarely used offsite devices.

2. Group devices by action

   Separate devices into upgrade, replace, temporary ESU, retire and isolate categories. This turns a messy upgrade problem into a clear roadmap.

3. Test business-critical applications

   Check accounting software, practice-management systems, CRM platforms, CAD tools, VPN clients, security agents, printers, phone integrations and browser-based tools before a broad rollout.

4. Protect data before changing devices

   Confirm that desktop data, documents folders, OneDrive sync, browser profiles, Outlook signatures and line-of-business data are backed up and recoverable. Stanfield IT can also review backup and disaster recovery before migration.

5. Roll out in waves

   Start with a pilot group, then move through low-risk users, standard office users, power users, shared devices and legacy-dependent machines. Each wave should include communication, support capacity and a rollback plan.

6. Strengthen security at the same time

   Use the migration to review MFA, conditional access, endpoint detection and response, Microsoft Defender, BitLocker, local admin rights, device compliance, patching, email security and recovery testing.

7. Remove Windows 10 from the environment

   Update procurement rules, endpoint policies, support documentation and lifecycle reporting so Windows 10 does not quietly return to production later.

How Stanfield IT can help

Stanfield IT helps Australian businesses move away from unsupported systems with less disruption and clearer ownership. The outcome is not just “new Windows”. It is a cleaner, safer and more manageable environment.