Windows 11 is the current major release of Microsoft's Windows NT operating system, released on October 5, 2021, as the successor to Windows 10 (2015). It is available as a free upgrade for devices running Windows 10 that meet its system requirements. The Windows Server counterpart, Windows Server 2025, was released in 2024. It is the first major version of Windows without a corresponding mobile edition, following the end of support for Windows 10 Mobile, and is implemented to mobile devices with different form factors, screen sizes and CPU architectures as a unified edition of Windows. As of October 14, 2025, it is the only fully supported consumer-oriented version of Windows.