Microsoft's March updates bring security fixes and new features to Windows 10 and 11

Microsoft has rolled out its March updates for Windows 10 and multiple versions of Windows 11. The latest patches address security flaws, introduce new features, and improve system performance. Users across different operating system editions will receive the changes gradually over the coming weeks.

The updates cover Windows 11 25H2, 24H2, and 26H1, as well as Windows 10. This marks the first official update for Windows 11 26H1, a version designed specifically for Arm-based devices using Qualcomm's Snapdragon X2 processors. For these users, Windows 11 Pro and Enterprise editions are particularly relevant, offering advanced Arm optimisations and full x64 app emulation.

Security remains a key focus, with 83 vulnerabilities patched in this release. Some of the fixed flaws were rated as high as 9.8 on the CVE severity scale. Alongside these fixes, Microsoft has added new Secure Boot certificates, while older ones will expire in June 2026. The update also brings functional improvements. File Explorer's search now works more efficiently, especially when scanning across multiple drives or within the 'This PC' section. A new speed test tool has been added, accessible via the taskbar. When clicked, it opens a web app through Bing Search to measure connection speeds. However, not all users will see the feature immediately, as the rollout is happening in stages. Windows 10 users are receiving similar updates, including the new Secure Boot certificates and fixes for certain GPU-related issues. The changes aim to maintain compatibility and performance for those still using the older operating system.

The March updates deliver critical security patches, new certificates, and performance tweaks for both Windows 10 and Windows 11. Users with Arm-based devices, particularly those running Snapdragon X2 processors, will benefit from the first dedicated update for Windows 11 26H1. The gradual rollout means some features, like the speed test, may take time to appear on all systems.