Microsoft's March updates bring security fixes and Arm-based Windows 11 debut

Microsoft has rolled out its March updates for Windows 10 and 11, bringing new features and security fixes. The release covers multiple versions, including the first update for Windows 11 26H1—a build designed for Arm-based devices. Alongside performance improvements, the company has also addressed 83 security vulnerabilities, some rated as highly severe.

The latest updates apply to Windows 11 versions 25H2, 24H2, and—for the first time—26H1. This newest edition is optimised for Qualcomm's Snapdragon X2 processors, marking its debut in public updates. Users will notice enhancements in File Explorer, particularly when searching across multiple drives or within the 'This PC' section.

Security remains a key focus. Microsoft has patched 83 vulnerabilities, with several scoring as high as 9.8 on the CVE severity scale. The update also introduces new Secure Boot certificates, while older ones will expire in June 2026. Windows 10 users receive similar protections, alongside fixes for specific GPU setups. A standout addition is the network speed test, now accessible via the taskbar. Clicking the icon opens a web app through Bing Search, though availability may vary as the feature rolls out gradually. Not all users will see it immediately, as the update is being distributed in stages. Windows 10 has not been left behind. Its March update includes the latest Secure Boot certificates and corrections for GPU-related issues, ensuring broader compatibility.

The March updates deliver security patches, performance tweaks, and new tools for both Windows 10 and 11. The speed test feature, though not yet universal, reflects Microsoft's push for built-in diagnostics. With 83 vulnerabilities addressed, users gain stronger protection while preparing for future hardware transitions, such as Arm-based Windows 11 devices.