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Facing the Flaw: Many organizations have already migrated to Windows 11, but a few diehards are refusing to leave Windows 10 behind. In fact, millions of computers are still running the aging, albeit perfectly functional, operating system, and according to one market analysis, that could soon turn into a security disaster.
Asset management company Lansweeper recently sounded the alarm on Windows 10, noting that a lot of organizations still haven't upgraded to Windows 11. A significant portion of PCs, or roughly 17% of all Windows client devices, per Lansweeper's research, are still running Windows 10. Put simply, about one in six machines out there is running the older OS, and that's a growing security risk for the whole industry.
Windows 11 has climbed to 78% of Windows devices, a trend also reflected by third-party trackers: StatCounter had Windows 11 above 70% of desktop share as of February 2026. What's left behind is a stubborn holdout base, hardcore enthusiasts and everyday users alike, who either can't or won't move to the newer OS.
