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Windows 11 23H2 Windows 11 23H2 Out-of-band update
Out-of-band

KB5078132

KB5078132: Cumulative update for Windows 11, version 23H2, January 2026. Cloud-file errors and OneDrive-hosted Outlook hangs fixed

In short

Fixes file and Outlook problems affecting some cloud-storage users after the January 13 update. Devices with Virtual Secure Mode enabled might still restart instead of shutting down or hibernating; KB5075941 resolves that issue.

Does it affect you? Applies to: Devices running Windows 11, version 23H2, that have already installed KB5077797 or KB5073455. The update is available for x64 and Arm64 devices.

Build
22631.6495
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • In short The shutdown and hibernation issue affects some Secure Launch-capable PCs with Virtual Secure Mode enabled. On those devices, the PC may restart instead.

The official sources are linked at the end of the page.

What changes

Improvements 2 changes

General

For: Devices running Windows 11, version 23H2

  • Includes security fixes and improvements from the January 13 update, KB5073455, and the January 17 update, KB5077797.1

Servicing stack

For: Devices receiving this update

  • The component that installs Windows updates receives quality improvements.2
    Includes servicing stack update KB5071963, build 22621.6265.

Fix 1 change

File System

For: Some users of cloud-based storage

  • Some apps no longer become unresponsive or show unexpected errors when opening or saving files in cloud storage such as OneDrive or Dropbox. In some Outlook setups with PST files on OneDrive, Outlook no longer hangs and fails to reopen; missing sent items and emails being downloaded again are also addressed.3
    Addresses problems after updates released on or after January 13, 2026, including Outlook configurations that store PST files on OneDrive.

Known issues

  1. Open Affects: Everyone

    Some devices with Virtual Secure Mode enabled might fail to shut down or hibernate

    Some Secure Launch-capable PCs with Virtual Secure Mode enabled might restart instead of shutting down or entering hibernation. KB5075941 and updates released after February 10, 2026 resolve the issue.4

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Security

No vulnerabilities are listed for this update.

Updated components

36 files changed since the previous update for the same versions.

Sources

Updated
Cited passages from Microsoft's official notes (4)
  1. 1. This update is cumulative and includes security fixes and improvements from the January 13, 2026, security update (KB5073455) and the out-of-band update (KB5077797) from January 17, 2026, in addition to the following: support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. Fixed: After installing the Windows update released on and after January 13, 2026, some applications became unresponsive or encountered unexpected errors when opening files from or saving files to cloud-based storage, such as OneDrive or Dropbox. support.microsoft.com
  4. 4. This issue is fully resolved in Windows updates released on February 10, 2026 (KB5075941), and in all updates released after that date. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake