Microsoft Windows 11 24H2 Update Version OS Builds 26200.9550 and 26100.9550

KB5124010 is the September 22, 2026 preview update for Windows 11, version 24H2, with quality improvements, new features, and fixes. It is the final preview update for 24H2 and includes OS Build 26100.9550. Reference IDs: KB5124009, KB5124008.

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Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Software

Application category: Utilities

Platform: Windows

Variant: 24H2

Version: OS Builds 26200.9550 and 26100.9550

Vendor information published: Sep 22, 2026

Original release notes: View on vendor site

Published on updatealert.io: Sep 24, 2026

Description: Client operating system for modern desktop and enterprise environments.