July 14, 2026—KB5099536 (OS Build 26100.33158)

July 14, 2026—KB5099536 OS Build 26100.33158 Applies To Windows Server 2025, all editions This cumulative update for Windows Server 2025 KB5099536, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows...

July 14, 2026—KB5099540 (OS Build 20348.5386)

July 14, 2026—KB5099540 OS Build 20348.5386 Applies To Windows Server 2022 This cumulative update for Windows Server 2022 KB5099540, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows release health...

August 27, 2026—KB5120996 (OS Build 28000.2804) Preview

August 27, 2026—KB5120996 OS Build 28000.2804 Preview Applies To Windows 11 version 26H1, all editions This cumulative update for Windows 11, version 26H1 KB5120996, includes production-quality improvements. Announcements and messages This section provides key notifications related to this releas...

KB5123273: Security Update for Pluton Devices (OS Builds 26100.9106 and 26200.9106)

KB5123273: Security Update for Pluton Devices OS Builds 26100.9106 and 26200.9106 Applies To Windows 11 Enterprise LTSC 2024 Important This update applies only to devices enrolled in hotpatch updates where the Pluton security processor has been configured as the TPM. For more information, see...

KB5123607: Security Update (OS Builds 26100.9106 and 26200.9106)

KB5123607: Security Update OS Builds 26100.9106 and 26200.9106 Applies To Windows 11 Enterprise LTSC 2024 Important This update applies only to devices enrolled in hotpatch updates. For more information, see Hotpatch updates. Improvements and fixes The following summary outlines key issues...

August 11, 2026—KB5121003 (OS Builds 26200.9168 and 26100.9168)

August 11, 2026—KB5121003 OS Builds 26200.9168 and 26100.9168 Applies To Windows 11 version 25H2, all editions Windows 11 version 24H2, all editions Want a quick overview?: Watch the Windows 11 release note video for this update. --- Announcements and messages This section provides key...

August 11, 2026—KB5121000 (OS Build 28000.2704)

August 11, 2026—KB5121000 OS Build 28000.2704 Applies To Windows 11 version 26H1, all editions This cumulative update for Windows 11, version 26H1 KB5121000 includes the latest security fixes and improvements, along with non-security updates from last month's optional preview release. Visit the...

August 11, 2026—Hotpatch KB5120994 (OS Builds 26200.9106 and 26100.9106)

August 11, 2026—Hotpatch KB5120994 OS Builds 26200.9106 and 26100.9106 Applies To Windows 11 Enterprise LTSC 2024 This Hotpatch update for Windows 11, version 25H2 and 24H2 KB5120994 includes security improvements. To learn more about differences between security updates, optional non-security...

August 11, 2026—Hotpatch KB5120228 (OS Build 26100.33222)

August 11, 2026—Hotpatch KB5120228 OS Build 26100.33222 Applies To Windows Server 2025 Datacenter: Azure Edition This update applies to Windows Server 2025 Datacenter & Standard machines connected to Azure Arc. To learn more about differences between security updates, optional non-security previe...

August 11, 2026—KB5120249 (OS Builds 19045.7663 and 19044.7663)

August 11, 2026—KB5120249 OS Builds 19045.7663 and 19044.7663 Applies To Windows 10 ESU Windows 10 Enterprise LTSC 2021 Windows 10 IoT Enterprise LTSC 2021 Windows Secure Boot certificate expiration Important Secure Boot certificates used by most Windows devices started to expire in June 2026...

August 11, 2026—KB5120233 (OS Build 26100.33296)

August 11, 2026—KB5120233 OS Build 26100.33296 Applies To Windows Server 2025, all editions This cumulative update for Windows Server 2025 KB5120233, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the Windows...

August 11, 2026—KB5120240 (OS Build 22631.7517)

August 11, 2026—KB5120240 OS Build 22631.7517 Applies To Windows 11 version 23H2, all editions This cumulative update for Windows 11, version 23H2 KB5120240, includes the latest security fixes and improvements, along with non-security updates from last month’s optional preview release. Visit the...

August 11, 2026—KB5120418 (OS Build 14393.9418)

August 11, 2026—KB5120418 OS Build 14393.9418 Applies To Windows Server 2016, all editions Win 10 Ent LTSB 2016 Win 10 IoT Ent LTSB 2016 Windows Secure Boot certificate expiration Important Secure Boot certificates used by most Windows devices started to expire in June 2026. Microsoft has been...

January 12, 2021 Servicing Stack Update (KB4599118)

January 12, 2021 Servicing Stack Update KB4599118 Applies To Azure Local, version 20H2 Improvements and fixes This update makes quality improvements to the servicing stack, which is the component that installs updates. Servicing stack updates SSU make sure that you have a robust and reliable...

January 12, 2021 Security Update (KB4598232)

January 12, 2021 Security Update KB4598232 Applies To Azure Local, version 20H2 Improvements and fixes This update contains miscellaneous security improvements to internal OS functionality. No additional issues were documented for this release. For more information about the resolved security...

September 23, 2025—KB5065790 (OS Build 22631.5984) Preview

September 23, 2025—KB5065790 OS Build 22631.5984 Preview Applies To Windows 11 version 23H2, all editions Windows Secure Boot certificate expiration Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the ability of certain personal and...

September 9, 2025—KB5065427 (OS Build 14393.8422)

September 9, 2025—KB5065427 OS Build 14393.8422 Applies To Windows 10, version 1607, all editions Windows Server 2016, all editions Windows Secure Boot certificate expiration Important: Secure Boot certificates used by most Windows devices have started expiring in June 2026. This might affect the...

May 16, 2025—Hotpatch KB5061258 (OS Build 26100.3983) Out-of-band

May 16, 2025—Hotpatch KB5061258 OS Build 26100.3983 Out-of-band Applies To Windows 11 Enterprise LTSC 2024 For information about Windows update terminology, see types of Windows updates and the monthly quality update types. To find an overview, see the update history for Windows 11, version 24H2,...

March 11, 2025—KB5053598 (OS Build 26100.3476) for Windows

March 11, 2025—KB5053598 OS Build 26100.3476 for Windows Applies To Windows 11 version 24H2, all editions For information about Windows update terminology, see types of Windows updates and the monthly quality update types. To find an overview of Windows 11, version 24H2, see its update history...

May 23, 2024—KB5039705 (OS Build 17763.5830) Out-of-band - EXPIRED

May 23, 2024—KB5039705 OS Build 17763.5830 Out-of-band - EXPIRED Applies To Win 10 Ent LTSC 2019 Win 10 IoT Ent LTSC 2019 Windows 10 IoT Core LTSC Windows Server 2019 Note EXPIRATION NOTICE IMPORTANT As of March 31, 2026, this update is no longer available from the Microsoft Update Catalog or oth...