KB5049981: January 2025 monthly security update for Windows 10, version 22H2 and Windows 10 Enterprise LTSC 2021 (version 21H2)

Windows Build Decoder: What a Windows build number means: 10.0.26100.2314 is Windows 11 24H2 with the November 2024 update. Version, KB, support dates, updates behind.

Paste a Windows build number from winver, ver, a system inventory or a vulnerability scan: 10.0.26100.2314, 19045.5487, Microsoft Windows [Version 10.0.22631.4460], a KB number or a version like 22H2. You get the Windows version (the same build is often a client and a server release), the cumulative update it has, how many monthly security updates behind it is, and how long that version gets updates. Versions, updates and dates come from Microsoft's release information for Windows 11, Windows 10 and Windows Server, read 2026-10-29.