Three in ten business PCs still run Windows 10, months after official support ended. HP dropped that number in an investor call this week, a stark reminder that the transition to Windows 11 remains stubbornly incomplete. For a channel that bills itself on managed services and security, that 30% ghost fleet is an unambiguous vulnerability.

The number comes from HP’s own telemetry across its installed base. It estimates that roughly 30 percent of the PCs its customers use day to day are still on Windows 10. Standard support for the operating system ended on October 14, 2025. That means no more free security patches, no more bug fixes, and no more technical assistance from Microsoft for the majority of users. Only organizations that have purchased Extended Security Updates (ESU) continue to receive protection—and that’s a temporary, costly lifeline.

HP sees an opportunity in the lag. The company told investors it expects the remaining Windows 10 machines to fuel a PC refresh cycle through 2026 and into 2027. That’s a silver lining for HP, but for IT leaders and consumers, the data point raises a more uncomfortable question: why, after years of warnings, are so many machines still running an unsupported OS?

The Windows 10 end-of-life timeline

Microsoft first declared the October 14, 2025 deadline back in 2021, just before Windows 11 launched. The company gave the industry four years to prepare. Initially, the cutoff seemed generous. Windows 11 debuted with stricter hardware requirements—TPM 2.0, Secure Boot, and specific CPU generations—but the idea was that enterprises would plan a gradual rollout, replace aging hardware, and be ready.

That didn’t happen. The pandemic-era PC buying spree complicated things. Many organizations purchased laptops and desktops in 2020 and 2021 that were, in some cases, already borderline for Windows 11 eligibility. Depreciation cycles that normally run three to five years suddenly clashed with an OS support timeline that felt aggressive. When inflation spiked and IT budgets tightened in 2023 and 2024, refresh projects got delayed. The result is a bulge of perfectly functional but increasingly insecure machines that businesses are reluctant to retire.

Microsoft offered a brief reprieve. In late 2023, it announced that Windows 10 would get one final feature update with some AI capabilities, and it later clarified that Extended Security Updates would be available for consumers for the first time—previously an enterprise-only option. That may have inadvertently signaled to some users that they could wait even longer. HP’s 30 percent figure suggests many took that message to heart.

The hardware compatibility hurdle

Windows 11’s hardware floor is the single biggest barrier. TPM 2.0 didn’t become mandatory on new PCs until mid-2016, but many corporate fleets from 2017 and 2018 still rely on Intel 7th Gen or AMD Ryzen 1000 series processors—chips that aren’t on Microsoft’s supported list. Even some machines that meet the specs have stubborn firmware issues that prevent the upgrade.

HP’s own portfolio reflects the split. The company has sold millions of EliteBook, ProBook, and Pavilion devices over the past seven years. Many of those are perfectly capable of running Windows 11 but need a TPM module enabled or a BIOS update. The friction is real: IT staff must touch each machine, verify compatibility, and often walk users through the process. With remote and hybrid work, that hands-on requirement has slowed rollouts to a crawl.

Custom PCs and edge devices compound the problem. Manufacturing, healthcare, and retail often run Windows 10 on non-standard hardware tied to proprietary peripherals. Upgrading the OS might break critical workflows. In those cases, the cost isn’t just the PC—it’s the downtime, the validation, and the risk of equipment failure. HP acknowledges this, noting that its managed services are seeing higher demand for OS migration planning rather than just hardware sales.

Enterprise reluctance and IT complexity

Large organizations don’t switch operating systems quickly. They test, they pilot, they deal with line-of-business application compatibility. Many still run custom software that only works on Windows 10 or requires Internet Explorer mode, which Windows 11 handles but often needs configuration. The sheer scale of some fleets—tens of thousands of endpoints—means that even a 90% migration rate leaves thousands of stragglers.

Acquisition targets and legacy subsidiaries add more complexity. A company may have standardized on Windows 11, only to absorb a smaller firm that ran everything on Windows 10. Some regulated industries, such as finance and defense, require extensive security reviews before deploying a new OS. Those reviews often slip. HP, as a major supplier to government and enterprise, sees those delayed rollouts firsthand.

Then there’s user resistance. Windows 11 moved the taskbar, changed the Start menu, and introduced design shifts that some workers find disorienting. While many of those annoyances have been softened by updates, the initial negative perception lingers. IT support desks hear complaints, and some managers opt to delay the switch to avoid a flood of tickets. That’s not a technical reason; it’s a human one. But it’s real, and it keeps PCs on Windows 10.

The cost of Extended Security Updates

Microsoft’s ESU program isn’t cheap for businesses. For Windows 10, the company announced a doubling of ESU pricing compared to the Windows 7 era, with a first-year cost of $61 per device for the standard plan and higher for those requiring advanced protection. For a 10,000-PC estate, that’s over $600,000 annually. After the first year, the price increases, pushing organizations toward a decision: pay up or replace hardware.

HP knows that math works in its favor. The company is betting that many customers will choose a new PC over a recurring fee for an aging OS. The total cost of a modern laptop with Windows 11, fresh warranty, and improved security spreads over three to five years, often coming out cheaper than extending a Windows 10 machine that’s already four or five years old. HP’s commercial revenue guidance reflects that assumption, with executives predicting a mid-single-digit growth in PC shipments driven partly by the ESU cliff.

For small and medium businesses, the economics are harder. Many lack the capital to replace hundreds of PCs at once. The ESU program for SMBs is less flexible, and the consumer option—available for the first time—comes with its own limits. The slow uptake suggests that a non-trivial number of organizations are simply going without patches, gambling that their existing endpoint security will hold. That’s a bet cybersecurity underwriters are watching closely.

The cybersecurity risk

An unsupported operating system is a magnet for threat actors. Once Microsoft stops issuing patches for Windows 10, every newly discovered vulnerability becomes a permanent zero-day. Ransomware gangs exploit these gaps aggressively. The healthcare, education, and local government sectors—often the slowest to upgrade—are the most exposed.

HP’s own security research team has been vocal about the risks of aging hardware and unpatched firmware. The company’s Wolf Security unit regularly publishes data on attack vectors that specifically target outdated OS versions. The 30% statistic isn’t just a business figure; it’s a threat landscape map. Each of those Windows 10 PCs represents a potential entry point for lateral movement attacks.

Microsoft Defender and third-party endpoint protection can mitigate some threats, but they can’t compensate for missing kernel-level fixes. Security compliance frameworks like PCI-DSS and HIPAA already flag unsupported operating systems as audit findings. Organizations failing a compliance check could face fines or loss of cyber insurance coverage. The window to act is closing, and the HP data suggests many haven’t yet felt enough urgency.

HP’s play in the refresh cycle

HP isn’t a disinterested observer. The company is the world’s second-largest PC manufacturer by shipments, and the Windows 10 end-of-life represents a multi-billion-dollar opportunity. CEO Enrique Lores has publicly framed the migration as a “super cycle” that could drive double-digit growth in commercial sales over several quarters.

To capture that demand, HP is expanding its device-as-a-service (DaaS) offerings. These subscription models bundle hardware, support, and lifecycle management into a per-device monthly fee. The pitch: instead of a large upfront capital outlay, businesses can spread the cost and ensure they’re always on a supported OS. HP reported that DaaS contracts grew 15% year-over-year in its most recent fiscal quarter, with Windows 11 migration serving as a primary driver.

HP is also pushing its AI-enhanced PCs, many of which run Windows 11 24H2 with the latest Copilot+ features. The timing is strategic. As organizations budget for hardware refreshes, the allure of on-device AI capabilities—real-time transcription, Microsoft Copilot integration, enhanced security—may tip the scales away from extending Windows 10. That narrative shift, from fear-of-missing-patches to desire-for-productivity-gains, is already visible in HP’s marketing.

A gradual and inevitable shift

Despite the alarming 30% figure, the migration to Windows 11 is accelerating. IDC and Gartner analysts note that commercial PC shipments have grown for three consecutive quarters, with refresh activity centered on Windows 11. Microsoft’s telemetry shows Windows 11 adoption at its highest level ever, though the mix varies widely by region. North America and Western Europe lead; parts of Asia-Pacific and Eastern Europe trail.

HP’s forecasted timeline—a tail that stretches into 2027—is realistic. The last Windows 10 holdouts will be the most challenging: embedded systems, kiosks, and industries with regulatory constraints. Some may never upgrade but instead migrate to alternative platforms like Linux or virtual desktops. HP acknowledges that its PC division must serve those edge cases with specialized products and services.

The consumer market is a wildcard. Microsoft has not disclosed how many home users remain on Windows 10, but HP’s consumer PC sales slid last quarter. Many households bought laptops in 2020 and have seen little reason to upgrade. The end of support may finally push them to act, but the price sensitivity is acute. A $500 laptop feels like a forced purchase if the old one still turns on. HP is targeting that segment with entry-level Windows 11 machines and trade-in programs, but the consumer response remains tepid.

What users and IT managers should do now

The 30% number is a wake-up call for anyone still running Windows 10 without a plan. The first step is an audit: identify every Windows 10 device, check its TPM and CPU compatibility, and categorize it as upgradeable, replaceable, or special-purpose. For upgradeable machines, Windows 11 24H2 offers a smooth in-place upgrade for most configurations. HP’s support site provides specific guidance for its own hardware, including BIOS updates that enable TPM 2.0 where it’s present but disabled.

For incompatible but otherwise functional PCs, the choices narrow. Extended Security Updates can buy at least one more year, but the cost is high. Third-party security solutions might fill some gaps, but they can’t replicate full OS support. The wisest path for many is a hardware refresh, especially now that AI-capable PCs are entering the market at competitive prices.

HP’s message to investors is clear: the Windows 10 end-of-life isn’t a cliff but a multi-year tailwind. For end users, the message is less rosy. That 30% of PCs running Windows 10 after the support deadline are a risk to their owners, their organizations, and the broader digital ecosystem. The migration is inevitable. The only question is whether it happens on a planned schedule or in a panic after a security incident.