Microsoft Windows 11 23H2 Update Version OS Build 22631.6495

KB5078132 is an out-of-band cumulative update for Windows 11, version 23H2, OS Build 22631.6495. It includes prior security updates and fixes an issue where apps could hang or error when opening or saving cloud-based files, including some Outlook PST scenarios. Reference IDs: KB5073455, KB5077797, KB5071963, KB5075941.

• Fixed an issue where some applications became unresponsive or returned unexpected errors when opening or saving files from cloud-based storage such as OneDrive or Dropbox.
• Fixed an Outlook issue in some configurations using PST files on OneDrive where Outlook could hang, fail to reopen, or cause sent items and downloaded emails to appear missing or re-download.

• Some devices with Virtual Secure Mode enabled might fail to shut down or hibernate and restart instead.

• This update is cumulative and includes security fixes and improvements from KB5073455 and KB5077797.
• Offered through Windows Update only to devices that already installed KB5077797 or KB5073455, and also available manually from the Microsoft Update Catalog.
• If the Windows Update setting "Get the latest updates as soon as they're available" is enabled, the update is delivered automatically; otherwise, install it manually via Settings > Windows Update > Download & install.
• IT administrators using Microsoft Intune or Windows Autopatch should follow Microsoft guidance for expedited quality updates.
• Includes servicing stack update KB5071963 for OS Build 22621.6265.

Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Other

Application category: Utilities

Platform: Windows

Variant: 23H2

Version: OS Build 22631.6495

Vendor release date: Jan 24, 2026

Published on updatealert.io: Jun 3, 2026

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