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Windows 11 23H2 Windows 11 23H2 Optional preview
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KB5043145

KB5043145: Cumulative update for Windows 11, version 23H2, September 2024. IE mode freezes and repeated email PIN prompts addressed

In short

Addresses several problems, including Edge becoming unresponsive in IE mode and repeated PIN prompts for encrypted email. Some devices may restart repeatedly or show blue or green screens; KB5044285 resolves that issue.

Does it affect you? Applies to: The update applies to Windows 11, version 23H2, and Windows 11, version 22H2 Enterprise and Education editions. The page notes that version 22H2 Home and Pro editions do not receive non-security preview updates.

Build
22631.4249
Restart
Required
Review notes Additional details from the official release notes (5) Read notes
  • What changes Windows 11, version 23H2 also includes the TCP data consistency improvement.
  • What changes Windows 11, version 23H2 also includes the updated COSA profiles for certain mobile operators.
  • What changes Windows 11, version 23H2 also includes the fix for Work Folders files failing to sync when Defender for Endpoint is on.
  • In detail Windows 11, version 23H2 also includes the TCP data consistency improvement.
  • What changes This update also includes servicing stack update KB5043143, which improves the component that installs Windows updates.

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

What changes

Fixes 6 changes

Microsoft Edge

  • Microsoft Edge's occasional unresponsiveness when you use IE mode is addressed.1

Task Manager

  • Task Manager's unresponsiveness when switching from a high-contrast theme to a normal theme is addressed.2

IE mode

For: Windows 11, version 22H2 Enterprise and Education users

  • Microsoft Edge sometimes stops responding when you use IE mode; this issue is addressed for Windows 11, version 22H2 Enterprise and Education.3

Transmission Control Protocol (TCP)

For: Windows 11, version 22H2 Enterprise and Education users

  • Inconsistent TCP data affects the accuracy of performance analysis tools used by file synchronization services; this issue is addressed for Windows 11, version 22H2 Enterprise and Education.4
    The inconsistency is between TCP_INFO_v1 and GetPerTcpConnectionEstats.

Outlook and other encrypted email apps

For: Windows 11, version 22H2 Enterprise and Education users

  • The issue that prompts for a PIN every time you open an encrypted email is addressed for Windows 11, version 22H2 Enterprise and Education.5

Microsoft Defender for Endpoint

For: Windows 11, version 22H2 Enterprise and Education users

  • The issue that prevents Work Folders files from syncing when Microsoft Defender for Endpoint is on is addressed for Windows 11, version 22H2 Enterprise and Education.6

New features 4 changes

Taskbar

Gradual rollout Verified in package
  • You can share local files directly from search results in the taskbar search box.7

Lock screen

Gradual rollout
  • When media is playing, its controls appear in the lower center of the lock screen.8

Start menu

Gradual rollout
  • The account manager in Start now has a Sign out command. Select the ellipses (...) to see other users and switch accounts.9

Copilot Pro subscription

Verified in package
  • You can manage your Copilot Pro subscription in Settings after signing in to your Microsoft account.10
    Go to Settings > Accounts.

Improvements 3 changes

Settings

Gradual rollout Verified in package
  • The Delivery Optimization page in Settings now matches the Windows 11 design.11
    Find it under Settings > Windows Update > Advanced options > Delivery Optimization.

Windows identity protection

  • People using Outlook or another encrypted email app need to enter their PIN only once, rather than being prompted more than once.12

Country and Operator Settings Asset

Verified in package

For: Windows 11, version 22H2 Enterprise and Education users

  • COSA profiles are updated for certain mobile operators.13

Removal 1 change

Windows Share

Gradual rollout Verified in package
  • The Windows Share window no longer has a search box.14

Known issues

  1. Resolved Affects: Everyone Resolved by KB5044285

    After installing this update, some customers have reported that their device restarts multiple times or becomes unresponsive with blue or green screens.

    After installing this update, some devices might restart multiple times or become unresponsive with blue or green screens. Some might open Automatic Repair after repeated restart attempts, and BitLocker recovery might be triggered. KB5044285 addresses this issue.15

    Resolution Fixed in KB5044285

    Install KB5044285 (or a later cumulative update) on affected devices. No manual workaround is required after updating.

Technical details

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

Data sheet

Released
2024-09-26
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5043076, KB5041587, KB5041585, KB5040527
+13 earlier KB5040442, KB5039302, KB5039212, KB5037853, KB5037771, KB5036980, KB5036893, KB5035942, KB5035853, KB5034848, KB5034765, KB5034204, KB5034123
Replaced by
KB5044285
VersionBuildChannel
23H2 22631.4249 General availability

Security

No vulnerabilities are listed for this update.

Updated components

3,115 files changed since the previous update for the same versions.

Top changed componentsFiles
Settings54
Graphics and display29
File Explorer and shell26
Windows Update22
Networking20
Security and sign-in15
Hyper-V and virtualization14
Search14
Bluetooth9
Emoji and input8
Remote Desktop6
Kernel5

Verified in package: changed files confirm Taskbar, Copilot Pro subscription, Settings, Country and Operator Settings Asset, Windows Share.

Sources

Updated
Cited passages from Microsoft's official notes (15)
  1. 1. [Microsoft Edge] It sometimes stops responding when you use IE mode. support.microsoft.com
  2. 2. [Task Manager] It stops responding when you switch from a high contrast theme to a normal theme. support.microsoft.com
  3. 3. [IE mode] Microsoft Edge sometimes stops responding when you use IE mode. support.microsoft.com
  4. 4. [Transmission Control Protocol (TCP)] There is inconsistent data between TCP_INFO_v1 and GetPerTcpConnectionEstats. File synchronization services use TCP connection performance analysis tools. support.microsoft.com
  5. 5. [Outlook and other encrypted email apps] This issue prompts for your PIN each time you open an encrypted email. support.microsoft.com
  6. 6. [Microsoft Defender for Endpoint] Work Folders files fail to sync when Defender for Endpoint is on. support.microsoft.com
  7. 7. [Taskbar] New! You can now share local files directly from the search results that appear in the Search box on the taskbar. support.microsoft.com
  8. 8. [Lock screen] New! Media controls now show in the lower part of the lock screen at its center when media is playing. support.microsoft.com
  9. 9. [Start menu] New! The Sign out command is now on the account manager when you open the Start menu. support.microsoft.com
  10. 10. [Copilot Pro subscription] New! You can now manage your Copilot Pro subscription in Settings. Sign in to your Microsoft account and go to Settings>Accounts. support.microsoft.com
  11. 11. [Settings] New! The Delivery Optimization Settings page now matches the Windows 11 design. support.microsoft.com
  12. 12. [Windows identity protection] Users no longer need to enter their credentials more than once for Outlook or another encrypted email app. A user will be prompted for their PIN one time only. support.microsoft.com
  13. 13. [Country and Operator Settings Asset] This update brings COSA profiles up to date for certain mobile operators. support.microsoft.com
  14. 14. [Windows Share] New! This update removes the search box from the Windows Share window. support.microsoft.com
  15. 15. After installing this update, some customers have reported that their device restarts multiple times or becomes unresponsive with blue or green screens. According to the reports, some devices automatically open the Automatic Repair tool after repeated restart attempts. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 15 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 3/5, clarity 4/5, completeness 3/5. 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