The Update BureauKB5074976: Cumulative update for Windows 10, versions 21H2 and 22H2, December 2025. Message Queuing disruption fixed for managed environments
Fixes Message Queuing problems introduced by the December 9 updates, including under load in clustered environments. It is available only from the Microsoft Update Catalog.
Does it affect you? Applies to: This update applies to Windows 10, version 22H2, and Windows 10 Enterprise LTSC 2021, version 21H2. Message Queuing problems primarily affect enterprise or managed IT environments; personal devices running Home or Pro are very unlikely to experience them.
What changes
Fixes 2 changes
Message queuing (MSMQ)
For: Enterprise or managed IT environments
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Message Queuing works again after problems that followed the December 9, 2025 updates. Personal devices running Windows Home or Pro are very unlikely to have been affected.1
Applies to Windows 10, version 22H2. The issue also affected clustered MSMQ environments under load and primarily affected enterprise or managed IT environments.
-
Message Queuing works again after problems that followed the December 9, 2025 updates. Personal devices running Windows Home or Pro are very unlikely to have been affected.1
Applies to Windows 10 Enterprise LTSC 2021, version 21H2. The issue also affected clustered MSMQ environments under load and primarily affected enterprise or managed IT environments.
Improvement 1 change
Servicing stack
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The component that installs Windows updates can better check whether a device is hosted on Azure.2
The servicing stack update uses an updated certificate chain to verify whether a device is hosted on Azure.
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2025-12-18
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
-
KB5071546, KB5068781, KB5066791, KB5066198
+27 earlier
KB5065429, KB5063842, KB5066188, KB5063709, KB5062649, KB5062554, KB5061087, KB5063159, KB5060533, KB5058481, KB5061979, KB5061768, KB5055612, KB5053643, KB5052077, KB5050081, KB5046714, KB5045594, KB5043131, KB5041582, KB5040525, KB5039299, KB5037849, KB5036979, KB5035941, KB5034843, KB5034203 - Replaced by
- KB5073724
| Version | Build | Channel |
|---|---|---|
| 21H2 | 19044.6693 | General availability |
| 22H2 | 19045.6693 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
Updated components
505 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| Audio | 11 |
| Graphics and display | 10 |
| Hyper-V and virtualization | 7 |
| File Explorer and shell | 5 |
| Kernel | 4 |
| Networking | 4 |
| Remote Desktop | 4 |
| Secure Boot | 4 |
| Emoji and input | 2 |
| Printing | 1 |
| Security and sign-in | 1 |
| Settings | 1 |
Sources
Cited passages from Microsoft's official notes (2)
-
1.
Fixed: After installing the Windows updates released on December 9, 2025, users experienced issues with the Message Queuing (MSMQ) functionality. This issue also impacts a clustered MSMQ environment under load.
support.microsoft.com -
2.
This servicing stack update (SSU) includes enhanced logic to verify whether a device is hosted on Azure, leveraging an updated certificate chain for validation.
support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Oct 21, 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 5/5, 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