Microsoft ended routine support for Windows 10 on October 14, 2025, closing a decade in which it was the default operating system of the PC era. The date was announced years in advance, the migration runway was long, and yet the installed base did not fully move: through the final year of support, Windows 10 still ran a substantial share of the world's PCs, by some tracking estimates not far from a third.
Twelve months after the deadline, the picture has sorted itself into three groups. Machines new enough to meet Windows 11's hardware requirements have largely upgraded. Businesses with immovable hardware are paying for Extended Security Updates. And a long tail of older consumer PCs is making an individual risk calculation, one machine at a time.
Why it matters
An unsupported operating system does not stop working; it stops being repaired. Every month that Patch Tuesday fixes a Windows vulnerability, that fix functions as a map for attackers working backward to the flaw — and unpatched Windows 10 machines accumulate exposure with each cycle. That is not hypothetical: the post-support exploitation of Windows 7 vulnerabilities gave the security community a template for what the Windows 10 long tail now faces.
The hardware divide is the sharper story. Windows 11 requires TPM 2.0 and relatively recent CPUs, a floor Microsoft has defended on security grounds. That requirement renders millions of perfectly functional PCs ineligible, turning a software transition into a hardware procurement decision — and raising a legitimate e-waste question that environmental groups and some regulators pressed Microsoft on before the deadline.
How it works
Microsoft's Extended Security Updates program is the bridge. For consumers, the company offered a one-year ESU covering critical and important security fixes through October 2026 — free with a Microsoft account sync or a modest one-time payment. For organizations, the commercial ESU runs up to three years with prices that rise each year, a structure deliberately designed to make staying more painful than leaving.
For machines that cannot run Windows 11 officially, the honest options are narrow: pay for ESU while planning replacement, migrate to a supported alternative such as a mainstream Linux distribution, or accept growing risk. Unsupported workarounds that bypass the hardware checks exist but leave users outside Microsoft's servicing guarantees.
Evidence
Microsoft's lifecycle pages set the October 14, 2025 end-of-support date and document the ESU terms for both consumer and commercial customers, including the year-over-year price escalation for organizations. StatCounter's desktop Windows version tracking shows the pace at which Windows 11 overtook Windows 10 through the transition period. Microsoft's security baseline documentation explains the TPM 2.0 and CPU-generation requirements as foundations for features like virtualization-based security.
The competing read
Microsoft's position — that the hardware floor buys real security and that a decade of support is generous by industry standards — is defensible. Critics counter that the company created the largest forced hardware turnover in PC history and that the consumer ESU's one-year limit is too short for households that bought machines in 2017 or 2018 in good faith. Both can be true: the security rationale is genuine, and so is the waste.
What happens next
The consumer ESU expires in October 2026, which forces the remaining consumer tail to a final decision this fall. Watch whether Microsoft extends it again — it did extend similar programs under pressure in the past — and watch the secondary market, where a wave of retired-but-functional corporate PCs typically appears a year after a Windows transition, with consequences for refurbishers and low-income buyers.