A California resident has filed a lawsuit aiming to block Microsoft from ending routine security updates for Windows 10 this October, arguing the move is a deliberate strategy to push users toward AI-ready Windows 11 hardware and consolidate dominance in the generative AI market. Lawrence Klein, the plaintiff, lodged the complaint in San Diego Superior Court just months before the October 14, 2025 end-of-support deadline, seeking an injunction that would compel Microsoft to continue free updates until Windows 10's share of Windows devices falls below 10%.

Klein’s central claim is that Microsoft is leveraging its operating system monopoly to force a mass migration—and with it, new PC purchases—by tying modern AI features like Copilot to Windows 11 and its stringent hardware requirements. The complaint states, “Microsoft's stratagem was to use its dominant position in the OS market to achieve a dominant position in the market for generative AI.” It adds that millions of users and businesses will be left vulnerable to cyberattacks once security patches stop, unless a court intervenes.

The legal challenge arrives as Windows 10 still powers over half of all Windows desktops globally—Statcounter’s April 2025 data pegs its share at about 53%. That translates to hundreds of millions of active machines, many of which cannot officially upgrade to Windows 11 because they lack a Trusted Platform Module (TPM) 2.0, UEFI Secure Boot, or a compatible CPU. Klein and his attorneys argue that Microsoft’s sunset timetable is not a genuine technical necessity but an arbitrary cutoff designed to boost hardware sales and embed its AI services as the default choice for users.

What the lawsuit demands—and what it doesn’t

The complaint asks the court to issue a mandatory injunction requiring Microsoft to:
- Continue providing free security and quality updates for Windows 10 until its user base falls below 10% of all Windows systems.
- Offer clearer disclosures about alternatives to upgrading.
- The plaintiff seeks no monetary damages, only attorneys’ fees.

Klein’s filing frames the issue as both a consumer protection matter and an antitrust concern. It alleges that by bundling generative AI features exclusively on Windows 11 Copilot+ PCs, Microsoft is raising barriers for competitors in the AI space and effectively forcing customers to subsidize its AI ambitions through unnecessary hardware purchases.

“With only three months until support ends for Windows 10, it is likely that many millions of users will not buy new devices or pay for extended support,” the complaint warns. “These users … will be at a heightened risk of a cyberattack or other data security incident, a reality of which Microsoft is well aware.”

Hardware barriers: TPM 2.0, UEFI, and the Copilot+ divide

Windows 11’s baseline requirements have been the stickiest point of the upgrade saga since the OS launched in 2021. At minimum, a PC must have:
- A 1 GHz or faster 64-bit processor with two or more cores, listed on Microsoft’s approved CPU roster.
- 4 GB RAM and 64 GB storage.
- UEFI firmware with Secure Boot capability.
- TPM version 2.0.
- DirectX 12 compatible graphics with a WDDM 2.0 driver.

Millions of older but still functional devices—desktop towers, laptops, all-in-ones—fail one or more of these checks, particularly the TPM and CPU requirements. Estimates from analysts have run as high as 240 million PCs worldwide that cannot move to Windows 11 without hardware modifications or replacement. While unofficial bypasses exist, they come with no guarantee of future update compatibility and may leave systems in an unsupported state.

On top of these minimums, Microsoft has defined a new class of “Copilot+ PCs” for on-device AI processing. These devices demand even more: a neural processing unit (NPU) capable of 40+ trillion operations per second (TOPS), 16 GB of RAM, and typically 256 GB or larger SSDs. Early Copilot+ machines shipped with Qualcomm Snapdragon X Elite chips, and AMD and Intel AI processors joined the list later. For the vast majority of Windows 10 machines, hitting Copilot+ specs is impossible without buying a brand-new device.

Klein’s complaint seizes on this hardware gap, portraying it as a calculated move to push AI-adoption through forced refresh cycles. The legal argument is that by making AI features exclusive to new hardware, Microsoft is not just innovating—it is exploiting its OS monopoly to lock out competitors in the emerging AI market.

Microsoft’s response: Extended Security Updates and migration paths

Microsoft has not remained silent about the impending cutoff. The company offers several official pathways for users who cannot or will not upgrade immediately:
- Consumer Extended Security Updates (ESU): For a one-time fee of $30, consumers can receive critical security patches for one additional year, through October 13, 2026. The program requires Windows 10 version 22H2 and a Microsoft Account for enrollment. In some cases, users can offset the cost by redeeming 1,000 Microsoft Rewards points or by backing up to OneDrive.
- ESU for organizations: Businesses and education customers can buy volume-licensing ESU agreements, stretching up to three years of post-retirement support.
- Windows 11 upgrade: Eligible PCs are offered the free upgrade via Windows Update, subject to the hardware check.
- Cloud PC and virtualization: Microsoft promotes Windows 365 and other virtual desktop solutions for those who cannot or prefer not to replace hardware.

These measures are intended to mitigate the security cliff, but they have drawn criticism. The consumer ESU’s reliance on a Microsoft Account irks users who prefer local accounts or offline systems. And at $30 per device, the cost can add up for households with multiple PCs—potentially rivaling the price of a new budget machine over a few years.

Legal experts who have reviewed similar product-lifecycle lawsuits note that obtaining a mandatory injunction is exceedingly difficult. A court would have to find that Klein demonstrates irreparable harm, a strong likelihood of success on the merits, and that the public interest favors forcing Microsoft to maintain a deprecated OS.

Key obstacles:
- Standing: A single consumer must show concrete, particularized injury. Future cybersecurity risk, while real, is often deemed speculative by courts unless a clear and imminent threat is proven.
- Product lifecycle discretion: Courts historically defer to companies’ business decisions about when to retire products, absent fraud or explicit statutory violation.
- Antitrust theory: To prevail on an antitrust claim, Klein must define a relevant market, prove Microsoft’s monopoly power in that market, and show that its conduct harms competition—not just competitors. Establishing that ending Windows 10 support monopolizes the generative AI market would require detailed economic analysis and evidence of anticompetitive intent, a high bar.
- Practicality: Ordering a company to continue patching an operating system indefinitely until an arbitrary market share threshold is met raises administrability concerns. A judge may be reluctant to micromanage security update delivery on this scale.

Despite these challenges, the lawsuit could draw regulatory attention. If consumer protection agencies or antitrust enforcers already have Microsoft’s AI bundling on their radar, this complaint may add fuel to broader investigations.

What’s at stake: E-waste, economics, and security

Beyond the courtroom, the Windows 10 end-of-support carries tangible consequences.

Environmental impact: Critics say forced hardware turnover will generate massive e-waste. The estimated 240 million incompatible PCs contain materials that are difficult to recycle—plastics, heavy metals, and rare earth elements. If even a fraction of these end up in landfills, the environmental footprint is significant.

Economic costs: For consumers, replacing a laptop starts at a few hundred dollars and can easily exceed $1,000 for a Copilot+-grade device. Enterprises face hardware refresh cycles, migration labor, compatibility testing, and temporary ESU licenses. Delaying upgrades risks security breaches that could dwarf the expense of a proper migration.

Security imperative: Microsoft’s position—and that of many IT professionals—is that maintaining multiple OS versions in parallel strains engineering resources and creates security gaps. Consolidating on Windows 11 allows the company to focus threat intelligence and patch development, resulting in a more resilient ecosystem. But the sudden expiration of support for an OS still powering half the world’s Windows PCs creates an unprecedented attack surface overnight.

What users and IT teams should do right now

The lawsuit may take months or years to resolve, but the October deadline is just weeks away. Pragmatic steps are essential:

  1. Inventory and classify: Identify every Windows 10 device in your environment. Check TPM, UEFI, and CPU compatibility using Microsoft’s PC Health Check tool. Categorize systems by risk exposure—internet-facing, handling sensitive data, or running legacy applications.
  2. Plan migrations: Prioritize high-risk machines for in-place upgrade if hardware supports it. For incompatible devices, decide between hardware refresh, ESU enrollment, or isolation.
  3. Evaluate ESU: For systems that cannot be replaced quickly, consumer ESU at $30 per device buys a year of critical patches. Organizations should cost-compare multi-year ESU licensing against new hardware.
  4. Explore alternatives: Consider Windows 365 Cloud PCs, virtualizing legacy apps, or—where appropriate—migrating older hardware to supported Linux distributions.
  5. Harden security: If some Windows 10 machines must remain in service after October 14, enforce strict network segmentation, disable unnecessary services, and ensure third-party applications are fully patched.
  6. Back up everything: Before any major upgrade or migration, verify backups and test disaster recovery plans.

The bigger picture: AI, antitrust, and the future of OS lifecycles

Klein’s complaint is a microcosm of bigger tensions roiling the tech industry. Platform vendors increasingly tie software support to hardware capabilities, steering users toward devices that unlock new revenue streams—in this case, AI subscriptions and services. Regulators in the EU and the US have scrutinized similar bundling practices, and Microsoft’s Copilot integration in Windows 11 has already raised eyebrows.

If the San Diego court were to grant any form of relief, it could set a precedent: vendors might need to justify end-of-life decisions with more than a calendar date, perhaps demonstrating that a critical mass of users has voluntarily migrated. Conversely, a swift dismissal would reinforce the status quo—allowing platform owners broad discretion in sunsetting legacy software.

For now, the lawsuit serves as a dramatic focal point for the frustration of millions of users facing a forced choice: upgrade hardware, pay for patches, or run an unsupported system. Neither side expects a final judgment before October, but the mere existence of the case may pressure Microsoft to expand ESU options or relax some hardware enforcement—if only to bolster its public relations defense.

As the October 14 deadline approaches, the advice from analysts is blunt: treat the lawsuit as a legal sideshow, not a life raft. The real decision point is immediate, and the clock is ticking.