August 27, 2026—KB5120998 (OS Builds 26200.9278 and 26100.9278) Preview

August 27, 2026—KB5120998 OS Builds 26200.9278 and 26100.9278 Preview Applies To Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions This cumulative update for Windows 11, version 25H2 and 24H2 KB5120998, includes production-quality improvements. Announcements and messages...

2026-08 Cumulative Update Preview for Windows 11, version 26H2 for arm64-based Systems (KB5120998) (26300.9278)

2026-08 Cumulative Update Preview for Windows 11, version 26H2 for arm64-based Systems KB5120998 26300.9278...

2026-08 Cumulative Update Preview for Windows 11, version 25H2 for arm64-based Systems (KB5120998) (26200.9278)

2026-08 Cumulative Update Preview for Windows 11, version 25H2 for arm64-based Systems KB5120998 26200.9278...

2026-08 Cumulative Update Preview for Windows 11, version 24H2 for arm64-based Systems (KB5120998) (26100.9278)

2026-08 Cumulative Update Preview for Windows 11, version 24H2 for arm64-based Systems KB5120998 26100.9278...

2026-08 Cumulative Update Preview for Windows 11, version 24H2 for x64-based Systems (KB5120998) (26100.9278)

2026-08 Cumulative Update Preview for Windows 11, version 24H2 for x64-based Systems KB5120998 26100.9278...

2026-08 Cumulative Update Preview for Windows 11, version 26H2 for x64-based Systems (KB5120998) (26300.9278)

2026-08 Cumulative Update Preview for Windows 11, version 26H2 for x64-based Systems KB5120998 26300.9278...

2026-08 Cumulative Update Preview for Windows 11, version 25H2 for x64-based Systems (KB5120998) (26200.9278)

2026-08 Cumulative Update Preview for Windows 11, version 25H2 for x64-based Systems KB5120998 26200.9278...