Windows 10 Still Being Used, Often Unpatched and Insecure (theregister.com)
(Monday July 20, 2026 @11:00AM (EditorDavid)
from the broken-Windows dept.)
Windows 10 still runs on 16.9% of the Windows devices [1]monitored by asset-tracking service Lansweeper. That's more than one in six, [2]The Register points out.
> A year ago, the operating system accounted for about half of the machines in its dataset, falling to the low-to-mid 40% range by the time Microsoft [3]ended standard support . The decline continued after that, reaching 18.6% in June, but Lansweeper says migration has now slowed to a crawl... Small and medium-sized businesses are particularly exposed. Lansweeper reckons that 21.4% of machines at small and medium-sized business still run Windows 10, with cost usually being the constraint that keeps the legacy operating system running. The exposure is greater in some sectors, with 23% of healthcare and pharmaceutical systems sticking with Windows 10, while consumer and retail devices hover at 22.7%.
>
> According to Lansweeper's data, "a Windows 10 device carries an average of 1,903 active CVEs against 652 on Windows 11. That's a 2.9x gap." Esben Dochy, principal technical evangelist at the company, told The Register that "the Windows 10 average also includes devices that have Extended Security Update patches applied." [According to Lansweeper's figures, 14% of Windows 10 assets have applied Extended Security Update patches.] Part of the problem, according to Lansweeper, is "patch diffing," in which Windows 11 fixes can be reverse-engineered to find flaws in Windows 10. "The supported OS effectively hands attackers a map into the unsupported one," Lansweeper said...
>
> Looking at other market share measures such as Statcounter, there was little change in the share of Windows 10 and its successor over the last few months after a surge following the end of support. As Lansweeper noted: "The easy migrations are done. What's left is the hard core: devices that haven't moved because they can't or won't."
Lansweeper's evangelist noted that in some cases there is no Windows 11-certified version yet for many medical devices and industrial or retail systems.
[1] https://www.lansweeper.com/blog/insights/windows-10-holdouts-carry-three-times-the-risk-of-windows-11/
[2] https://www.theregister.com/os-platforms/2026/07/16/windows-10-refuses-to-die-and-the-security-bill-is-coming-due/5271987
[3] https://www.theregister.com/off-prem/2025/10/09/millions-of-business-pcs-still-on-windows-10-as-d-day-nears/803998
> A year ago, the operating system accounted for about half of the machines in its dataset, falling to the low-to-mid 40% range by the time Microsoft [3]ended standard support . The decline continued after that, reaching 18.6% in June, but Lansweeper says migration has now slowed to a crawl... Small and medium-sized businesses are particularly exposed. Lansweeper reckons that 21.4% of machines at small and medium-sized business still run Windows 10, with cost usually being the constraint that keeps the legacy operating system running. The exposure is greater in some sectors, with 23% of healthcare and pharmaceutical systems sticking with Windows 10, while consumer and retail devices hover at 22.7%.
>
> According to Lansweeper's data, "a Windows 10 device carries an average of 1,903 active CVEs against 652 on Windows 11. That's a 2.9x gap." Esben Dochy, principal technical evangelist at the company, told The Register that "the Windows 10 average also includes devices that have Extended Security Update patches applied." [According to Lansweeper's figures, 14% of Windows 10 assets have applied Extended Security Update patches.] Part of the problem, according to Lansweeper, is "patch diffing," in which Windows 11 fixes can be reverse-engineered to find flaws in Windows 10. "The supported OS effectively hands attackers a map into the unsupported one," Lansweeper said...
>
> Looking at other market share measures such as Statcounter, there was little change in the share of Windows 10 and its successor over the last few months after a surge following the end of support. As Lansweeper noted: "The easy migrations are done. What's left is the hard core: devices that haven't moved because they can't or won't."
Lansweeper's evangelist noted that in some cases there is no Windows 11-certified version yet for many medical devices and industrial or retail systems.
[1] https://www.lansweeper.com/blog/insights/windows-10-holdouts-carry-three-times-the-risk-of-windows-11/
[2] https://www.theregister.com/os-platforms/2026/07/16/windows-10-refuses-to-die-and-the-security-bill-is-coming-due/5271987
[3] https://www.theregister.com/off-prem/2025/10/09/millions-of-business-pcs-still-on-windows-10-as-d-day-nears/803998