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The March 2026 Windows security update is now available

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Windows
Microsoft 365 admin center

What the notice says

Microsoft’s text, safely structured

The March 2026 security update is now available for all supported versions of Windows. We recommend that you install these updates promptly. For more information about the contents of this update, see the release notes, which are easily accessible from the Windows 11 update history page. To learn more about the different types of monthly quality updates, see Windows monthly updates explained.

Highlights for the Windows 11, version 25H2 update

  • This security update includes improvements that were a part of update KB5077181 (released February 10, 2026).
  • This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.
  • This update adds high‑confidence device targeting, expanding coverage for automatic Secure Boot certificate delivery.
  • This update improves File Explorer search reliability when searching across multiple drives or "This PC".
  • This update improves the reliability of choosing trusted catalog files. It adds a warning dialog that helps you confirm that the file you select comes from a trusted source. ​​​​​​​

Short on time? Watch our Windows 11 release notes video for this month's tips.

For instructions on how to install this update, see the KB for your operating system listed below:

  • Windows 11, version 26H1: KB5079466
  • Windows 11, versions 25H2 and 24H2: KB5079473
  • Windows 11, version 23H2: KB5078883
  • Windows 11 Enterprise LTSC 2024: Hotpatch KB5079420
  • Windows 10, versions 22H2 and 21H2: KB5078885
  • Windows 10 Enterprise LTSC 2019 and Windows Server 2019: KB5078752
  • Windows 10 LTSB 2016 and Windows Server 2016: KB5078938
  • Windows Server 2025: KB5078740
  • Windows Server 2025 Datacenter: Azure Edition: Hotpatch KB5078736
  • Windows Server 2022: KB5078766
  • Windows Server 2022 Datacenter: Azure Edition: Hotpatch KB5078737
  • Windows Server 2012 R2: KB5078774
  • Windows Server 2012: KB5078775

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