Windows 10 still powers one in six PCs today – and it could become a major security problem very soon

• The migration is slower as the more difficult cases remain on the old OS
• Windows 10 devices are said to have 3 times as many active CVEs
• Technical limitations and physical upgrades are not a big problem

According to new Lansweeper data, as many as 16.9% of Windows client devices, which equates to roughly one in six overall, are still running Windows 10.

While Windows 11 now accounts for 78.8% of installs and Windows 10’s market share is down from around 50% in mid-2025, Lansweeper warns that migration is starting to slow, suggesting that the remaining Windows 10 market share could show no signs of going anywhere.