A California man has filed a lawsuit aiming to block Microsoft from ending free support for Windows 10, arguing the October 14, 2025 cutoff is a ploy to force users onto AI‑ready hardware and corner the generative AI market. The complaint, lodged in San Diego Superior Court by Lawrence Klein, seeks an extraordinary injunction: compel Microsoft to keep delivering free security updates until Windows 10 drops below 10% of all Windows installs.

The legal salvo arrives just as Windows 11 has finally overtaken its predecessor in market share, yet an estimated 45% of Windows PCs—hundreds of millions of devices—still run the decade‑old OS. For many, the upgrade path is blocked by Windows 11’s strict hardware requirements, setting the stage for a messy transition that critics warn could create an e‑waste crisis.

The Lawsuit’s Core Allegations

Klein’s complaint accuses Microsoft of “forced obsolescence” and an “attempt to monopolize the generative AI market.” It contends that discontinuing Windows 10 support will render millions of PCs insecure unless users buy new Copilot+ PCs—devices that pack a neural processing unit (NPU) required for Microsoft’s on‑device AI features like Recall and Cocreator.

“With only three months until support ends … many millions of users will not buy new devices or pay for extended support,” the complaint states. “These users … will be at a heightened risk of a cyberattack or other data security incident, a reality of which Microsoft is well aware.”

Klein, who owns two Windows 10 laptops, says both will become obsolete in October. He asks the court to order Microsoft to continue supporting Windows 10 without additional charge until the OS’s user base falls below 10% of total Windows users. The lawsuit does not specify monetary damages beyond attorneys’ fees.

What Actually Happens on October 14, 2025

Contrary to some alarmist headlines, Windows 10 PCs won’t suddenly stop working. Microsoft will simply cease issuing free security updates, feature improvements, and technical support. The OS will boot and run, but without ongoing patches, its attack surface will widen over time, making it a tempting target for malware.

Microsoft has offered Extended Security Updates (ESU) as a safety net, though the path differs sharply for consumers and businesses.

Consumer ESU: One Extra Year

Individual users on Windows 10 version 22H2 can purchase one year of security updates through October 13, 2026. The cost is $30, but Microsoft provides two no‑charge routes: linking PC settings to a Microsoft cloud account, or redeeming 1,000 Microsoft Rewards points. This consumer ESU covers only critical and important security fixes, not new features or design changes.

Enterprise ESU: Up to Three Years, Escalating Cost

Organizations can buy annual ESU licenses for up to three years, with coverage ending October 10, 2028. Pricing starts at $61 per device for Year 1, jumps to $122 for Year 2, and reaches $244 for Year 3—a deliberate steepening to accelerate migration. Discounts apply for certain cloud‑managed scenarios, and Windows 365 or Azure Virtual Desktop entitlements include ESU at no extra cost.

It’s worth noting that Microsoft 365 Apps on Windows 10 will still receive security updates until October 10, 2028, but that’s distinct from the OS‑level ESU.

The AI Angle: Copilot vs. Copilot+ PCs

Klein’s complaint merges two separate threads: the Windows 10 sunset and Microsoft’s push for AI‑capable hardware. Copilot, the cloud‑backed chatbot, runs on standard Windows 11 PCs and, in a limited preview form, even on some Windows 10 machines. No NPU is needed.

Copilot+ PCs, introduced in 2024, unlock local, low‑latency AI experiences—such as real‑time video effects, Cocreator in Paint, and the controversial Recall feature. These require a neural processing unit with at least 40 trillion operations per second (TOPS), along with 16 GB RAM and 256 GB storage. That hardware floor excludes virtually all pre‑2024 laptops and desktops.

So while the lawsuit’s narrative that AI “needs” an NPU is partially accurate for on‑device features, it glosses over the fact that cloud‑based Copilot remains available on any Windows 11 PC, NPU or not. Microsoft has maintained that Copilot+ is a premium hardware tier, not a forced buy‑in for AI.

Market Reality: A Staggering Number of Orphaned PCs

StatCounter data from July 2025 shows Windows 11 at roughly 50‑52% of Windows share, with Windows 10 holding around 45%. That still represents something on the order of 400 million active machines. Analysts at Canalys warned in late 2023 that up to 240 million Windows 10 PCs could become e‑waste after support ends—a volume they dramatized as “a pile [of laptops] 600 km taller than the moon.”

The primary bottleneck is hardware. Windows 11 mandates TPM 2.0, Secure Boot, and a strict list of supported processors, cutting off many otherwise functional machines. Microsoft has called these non‑negotiable security baselines, but the result is a forced upgrade cycle that environmental advocates decry.

To win under Section 2 of the Sherman Act, a plaintiff must prove monopoly power in a relevant market and willful acquisition or maintenance of that power through exclusionary conduct. Courts are reluctant to punish companies for “superior product, business acumen, or historic accident.”

Even if one defines the market as “Windows PCs with on‑device AI features,” Microsoft would argue that cloud‑based Copilot, third‑party tools, and competing platforms (macOS, ChromeOS) are viable substitutes. The Copilot+ tier can be framed as product segmentation, not exclusion. Moreover, the ESU programs show Microsoft isn’t abruptly abandoning users; it’s offering paid bridges.

California consumer‑protection laws (Unfair Competition Law, Consumers Legal Remedies Act) might offer a lower bar—plaintiffs could argue the end‑of‑support is an “unfair” practice given the e‑waste and security fallout. But proving that a well‑telegraphed lifecycle endpoint constitutes unlawful conduct is a stretch. The requested remedy—free updates until sub‑10% share—would be an unprecedented judicial intrusion into product management.

Practical Steps for Windows 10 Users

Whether you’re an individual or an IT manager, the clock is ticking. Here’s a pragmatic checklist:

  • Inventory your hardware. Run the PC Health Check tool to see if your devices meet Windows 11 requirements. Check TPM 2.0 activation and CPU compatibility.
  • Enroll in consumer ESU if you must stay on Windows 10. The free path via Microsoft Rewards or account sync buys you until October 2026. Keep the $30 option as a fallback.
  • For businesses, model the cost of ESU versus new hardware. Year‑over‑year doubling makes ESU increasingly unattractive. Consider Windows 365 or Azure Virtual Desktop to bridge legacy endpoints while migrating to Windows 11 in the cloud.
  • Plan for Copilot+ only if you need local AI features. For most knowledge workers, cloud‑based Copilot suffices. Reserve NPU‑equipped machines for roles that genuinely benefit from on‑device latency and privacy.
  • Don’t bank on third‑party micro‑patching. Unofficial security fixes exist but lack vendor validation and can introduce instability. Use them only as a last resort, layered behind strict network segmentation.

The Bottom Line

Microsoft’s Windows 10 end‑of‑support is not a hidden trap; it has been advertised for years. The ESU programs, while not free, provide a controlled off‑ramp that undercuts claims of an abrupt cliff. The lawsuit highlights legitimate pain points—cost, e‑waste, and the pressure to buy new AI‑branded hardware—but its demands face steep legal odds.

For the hundreds of millions still running Windows 10, the practical choice is clear: either pay a modest fee to extend security until 2026, migrate to Windows 11 on compatible hardware, or accept the growing risk of an unpatched OS. None of those options will satisfy everyone, but they are all more predictable than waiting for a judge to rewrite a product lifecycle.