Document Date: April 14, 2026 Purpose: To provide a comprehensive chronological overview of Windows 11 feature updates, including build numbers, release dates, and notable changes. 1. Overview Windows 11 was officially announced on June 24, 2021, and released to the general public on October 5, 2021. Microsoft shifted to an annual feature update cadence (once per year) for Windows 11, unlike the biannual schedule of Windows 10. Each feature update receives 24 months of support for Home/Pro editions and 36 months for Enterprise/Education editions. 2. Version History Summary Table | Version | Codename | Build | Release Date | Support Status | |---------|----------|-------|---------------|----------------| | 21H2 | Sun Valley | 22000 | Oct 4, 2021 | EOL (Oct 10, 2023) | | 22H2 | Sun Valley 2 | 22621 | Sep 20, 2022 | EOL (Oct 8, 2024) | | 23H2 | Sun Valley 3 | 22631 | Oct 31, 2023 | Supported | | 24H2 | Hudson Valley | 26100 | Oct 1, 2024 | Supported | | 25H2 | (Unknown) | 27xxx | Expected Oct 2026 | Preview | Note: Microsoft changed the versioning scheme starting with 24H2 to align with the year of release (e.g., 24H2 = second half of 2024). 3. Detailed Version Breakdown 3.1 Windows 11 21H2 (Build 22000) – "Sun Valley" Release Date: October 5, 2021 Support End: October 10, 2023