Microsoft has released an out-of-band (OOB) update to fix installation issues caused by a recently pulled Windows 11 preview update.
The situation highlights a recurring challenge in modern IT operations:
Even non-security updates can introduce critical system issues — requiring immediate remediation.
What happened?
Microsoft initially released KB5079391, an optional cumulative update for:
- Windows 11 24H2
- Windows 11 25H2
The update included:
- Smart App Control improvements
- Display enhancements
- 29 total changes
However, shortly after rollout, users began reporting installation failures.
The issue
Affected users encountered the error:
0x80073712 — “Some update files are missing or have problems”
Key impact:
- Updates failed to install
- Systems remained partially updated
- Deployment pipelines were disrupted
Microsoft quickly halted the rollout after confirming the issue.
The fix: KB5086672
On March 31, 2026, Microsoft released:
👉 KB5086672 (Out-of-Band update)
This emergency patch:
- Replaces the faulty KB5079391 update
- Fixes installation errors
- Includes all previous improvements and security updates
- Restores update stability
How updates are delivered
Devices may receive the fix automatically if:
- “Get the latest updates as soon as they’re available” is enabled
Otherwise, users can install manually:
👉 Settings → Windows Update → Download & Install
A pattern of recent emergency fixes
This is not an isolated incident.
In recent weeks, Microsoft has released multiple out-of-band updates, including:
Sign-in issues (critical)
- Patch Tuesday update broke authentication
- Impacted:
- Microsoft Teams
- OneDrive
- Edge
- Microsoft 365 Copilot
Enterprise issues
- Bluetooth visibility bugs
- RRAS (Routing and Remote Access Service) vulnerabilities
Vendor-related issues
- C:\ drive access problems on Samsung devices
- Caused by:
- Samsung Galaxy Connect
- Samsung Continuity Service
What this means for IT teams
Frequent OOB updates indicate:
- Increasing complexity of Windows update ecosystem
- Higher risk of regressions in non-security updates
- Need for stronger update validation processes
Best practices moving forward
1. Test updates before deployment
Especially optional preview updates
2. Monitor update channels closely
Watch for early user reports and known issues
3. Use staged rollouts
Avoid deploying updates to all systems at once
4. Be cautious with preview updates
They are not always production-ready
5. Maintain rollback strategies
Ensure rapid recovery in case of failure
Key takeaway
This incident reinforces a key operational lesson:
Not all updates improve stability — some require immediate fixes themselves.
For organizations, success lies not just in patching quickly,
but in patching safely and strategically.
