Approximately 16.9% of Windows client devices are still using Windows 10, which has three times more active Common Vulnerabilities and Exposures (CVEs) than Windows 11, totaling 1,903 compared to 652. Two-thirds of the vulnerabilities in Windows 10 are classified as high or critical, with an exploitable rate 1.7 times greater than in Windows 11. Migration to Windows 11 is not primarily hindered by technical limitations, as only a small fraction of Windows 10 devices do not meet the hardware requirements. Additionally, nearly 20% of monitored Windows devices are running end-of-life operating systems, including Windows 7, 8.1, and XP.