Microsoft is heading toward a pivotal moment in its Windows lifecycle, and the scale of the challenge ahead is now significantly larger than previously understood. New industry data shows that one billion active Windows devices are still running Windows 10, raising alarms about a worldwide security crisis that could unfold as the operating system approaches the end of its support window.
This startling figure emerged after Dell disclosed during its latest earnings call that the number of PCs still on Windows 10 is double what analysts had estimated. The new data has reshaped industry expectations and intensified concern that millions of users and businesses may soon face serious cybersecurity risks if they fail to transition to supported systems.
A Closer Look: Half of All Windows 10 PCs Are Too Old to Move Forward
Dell’s breakdown of the global Windows PC base has revealed two distinct issues—each carrying its own layer of complexity:
1. Around 500 million PCs on Windows 10 cannot upgrade to Windows 11
These devices rely on older hardware and fail to meet Microsoft’s stringent security and processor requirements introduced with Windows 11. Analysts had previously believed this figure to be closer to 250 million, but Dell’s updated assessment suggests that aging machines are far more widespread than expected.
2. An additional 500 million PCs can run Windows 11, but their owners refuse to upgrade
This second group has emerged as the more unexpected problem. Many users with compatible hardware are choosing to stay on Windows 10, either out of preference, convenience, or resistance to change.
The resulting situation means that two-thirds of the global Windows community is either technologically blocked or actively unwilling to move to the latest version of Windows—a critical issue as the countdown to Windows 10’s retirement continues.
Industry observers have noted that user hesitancy has long been part of the Windows ecosystem, but the sheer scale revealed by Dell’s update has reframed the urgency of the problem. Analysts are now closely watching whether Microsoft can persuade users to move forward or whether the market will remain entrenched in older software.
Microsoft’s Security Update Reversal Complicates the Road Ahead
Earlier this year, Microsoft made a significant and unexpected change to its Windows 10 support strategy. The company announced that Windows 10 home users would receive extended security updates (ESU) for free until October 2026, reversing earlier expectations that only businesses would have access—at a cost—to extended protection.
The move was designed to ease the transition for consumers, but it has introduced new uncertainties:
- There is no clear data on how many users or organizations have enrolled in the ESU program.
- It is unknown how many Windows 10 devices have already stopped receiving essential security patches.
- Businesses must still pay for ESU support, creating a potential financial burden for large organizations operating thousands of older devices.
Analysts had previously argued that extended security updates should have been limited to users with legacy hardware, with compatible devices nudged toward Windows 11. Instead, Microsoft’s broad extension has resulted in a fragmented environment where devices may or may not be protected, and the company has limited visibility into the actual state of the global Windows 10 ecosystem.
A Mounting Cybersecurity Risk as Windows 10 Nears Its End
The deeper concern shared by cybersecurity experts is the potential for a widespread, global-scale vulnerability once Windows 10 reaches its final phaseout. With millions of devices running outdated software, threat actors could exploit unpatched systems, leading to coordinated attacks, ransomware outbreaks, or data breaches on an unprecedented scale.
These risks are amplified by three converging factors:
- Massive numbers of incompatible PCs stuck on Windows 10
- Millions of users declining to upgrade despite having capable hardware
- Unpredictable security coverage due to inconsistent ESU enrollment
For enterprises, the stakes are even higher. Organizations with large inventories of aging machines must decide whether to absorb the cost of extended updates, accelerate hardware refresh plans, or shift employees to newer platforms—a decision that requires both investment and operational disruption.
500 Million PCs Could Become E-Waste by 2026
Beyond cybersecurity concerns, the industry is also grappling with the environmental implications of Dell’s findings. If the 500 million devices that cannot upgrade must eventually be replaced, the world could face an unprecedented wave of hardware disposal, potentially overwhelming recycling systems and worsening global e-waste challenges.
Industry experts warn that unless viable alternatives gain widespread adoption, the PC market could face a landfill crisis by 2026—just as organizations rush to replace outdated machines before support ends.
Alternative Operating Systems Gain Attention—but Adoption Remains Slow
Some analysts have suggested that users with outdated Windows 10 systems could transition to Linux distributions or ChromeOS Flex, both of which offer a path to continued security support without requiring new hardware. While these alternatives provide a cost-effective solution, their adoption remains niche, primarily due to user reluctance and unfamiliarity with non-Windows ecosystems.
Still, as 2026 approaches, these options may gain momentum, especially among schools, small businesses, and budget-conscious households.
