Windows 10 end of life: what UK businesses need to do before October 2025

Microsoft officially ended support for Windows 10 on 14 October 2025. After that date, no security updates, bug fixes or technical support are provided. For UK SMEs, that has serious implications for cybersecurity, compliance and operational reliability, and planning ahead remains essential for anyone still running it.

What “end of life” actually means

When an operating system reaches end of life, it stops receiving security patches and support from Microsoft. Any new vulnerabilities discovered after 14 October 2025 remain unpatched, increasing the risk of cyberattacks, data breaches and downtime. In practice, once Windows 10 is out of support:

• No more security updates: new threats won't be fixed.
• No Microsoft support for issues or failures.
• No new features or performance improvements.
• Software compatibility declines over time as vendors move on.

The risks of staying on Windows 10

Remaining on Windows 10 after support ends is technically possible, but risky. The main issues are:

• Increased cybersecurity threats: attackers actively scan for outdated software because the vulnerabilities stay open indefinitely. The 2017 WannaCry attack exploited unpatched Windows systems and caused widespread disruption across the NHS and UK organisations.
• Compliance challenges: GDPR expects 'appropriate technical measures' to protect data, and outdated software rarely qualifies. Cyber Essentials certification requires supported operating systems, which can block contracts in government, education and regulated sectors.
• Software and app compatibility: vendors are phasing out Windows 10 support, so expect apps that don't update correctly, integration failures and reduced performance.
• Cyber insurance limitations: many policies now include clauses about supported systems, and insurers may reduce or refuse cover if an unsupported OS contributed to a breach.

Should you pay for Extended Security Updates (ESU)?

Microsoft offers Extended Security Updates for Windows 10, but only as a temporary measure: security updates only, not features or support. Pricing starts at around £45 per device for the first year and rises each year after. ESU can make sense if you need more time to replace hardware or rely on a critical application that isn't yet compatible with Windows 11. For most SMEs, though, it's a short-term safety net rather than a long-term solution; a proper Windows 11 migration is the better investment.

Migrating to Windows 11 with minimal disruption

A well-planned upgrade avoids downtime and user frustration. At Osiris IT, we use a staged, low-risk approach:

1. Device and hardware readiness check: we assess which devices are compatible with Windows 11 and plan upgrades or replacements where needed.
2. Data backup and protection: before any changes, we take full backups so data is secure and recoverable.
3. Staged deployment: we roll out upgrades in phases, with testing at each stage, often outside business hours.
4. Training and post-migration support: we provide user training and helpdesk support so your team feels confident with Windows 11.

Why Windows 11 is worth the upgrade

Upgrading isn't only about avoiding risk. Windows 11 brings genuine business benefits:

• Stronger security by design, with TPM 2.0, Secure Boot and hardware-based protection.
• Improved performance, with faster boot times and smoother operation.
• A modern interface optimised for productivity and hybrid working.
• Better integration with Microsoft 365, Teams and cloud collaboration.
• Built-in AI tools such as Microsoft Copilot on supported devices.
• Continued support until at least 2031.

Frequently asked questions

Can I keep using Windows 10 after 14 October 2025? Yes, but it won't be secure or supported, and most organisations will consider it too high-risk for business use.

Is the Windows 11 upgrade free? It's free if your device meets the system requirements. If the hardware is too old, you'll need a replacement device.

What if my hardware doesn't support Windows 11? We can help you weigh up upgrade versus replacement and source compliant devices through our IT procurement service. Windows 11 requires TPM 2.0, Secure Boot and specific CPU generations (Intel 8th gen or AMD Ryzen 2000 or newer); most devices from 2018 onwards are compatible.

How long does a business migration take? Most small and medium businesses complete the process in two to four weeks, depending on the number of devices and the complexity involved. We work in stages, often upgrading outside business hours, and provide temporary support throughout the transition.