Full Report
Microsoft is working to fix a known issue that causes crashes and launch failures for Microsoft Teams and New Outlook users after installing updates released since the August 2026 Patch Tuesday. [...]
Analysis Summary
# Morning News Roll-up September 3, 2026
## Overview
Recent Windows updates released during and after the August 2026 Patch Tuesday cycle have introduced several stability issues. The primary concern involves application crashes for Microsoft Teams and New Outlook on ARM-based hardware, while secondary issues include broken printing functionality and false-positive antivirus alerts.
## Top Stories
### Microsoft Teams and Outlook Fail to Launch on ARM-based Windows PCs
- Summary: Microsoft has confirmed that Windows security updates (specifically KB5121003) are causing Microsoft Teams and New Outlook to crash or fail to launch on ARM-based devices like the Surface Pro 11. The issue appears linked to the Auto Super Resolution Package on Copilot+ PCs.
- Source: hxxps://www[.]bleepingcomputer[.]com/news/microsoft/microsoft-teams-outlook-fail-to-launch-on-arm-based-windows-pcs/
### August .NET Framework Updates Break Printing and PDF Export
- Summary: Microsoft confirmed that the August 2026 .NET Framework updates are causing functional failures in Windows Presentation Foundation (WPF) applications, specifically breaking the ability to print or export documents to PDF.
- Source: hxxps://www[.]bleepingcomputer[.]com/news/microsoft/microsoft-august-updates-break-printing-pdf-export-in-wpf-apps/
### Microsoft Defender Issues and Peripheral-Induced System Crashes
- Summary: Users are reporting "EXCEPTION_ACCESS_VIOLATION" errors and system crashes linked to RGB lighting peripherals following August updates. Additionally, a bug in recent Defender updates is incorrectly alerting users that their antivirus protection is disabled.
- Source: hxxps://www[.]bleepingcomputer[.]com/news/microsoft/microsoft-asks-users-to-ignore-antivirus-is-turned-off-errors/
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# Microsoft Teams and Outlook Launch Failures (August 2026 Update)
A known issue affecting the stability of productivity applications on Windows 11 ARM-based devices following the installation of August 2026 security updates.
## Key Points
- Microsoft Teams and "New" Outlook for Windows are experiencing immediate crashes or failing to initialize.
- The issue is specifically tied to Windows 11 version 24H2 running on ARM architecture.
- New or "freshly imaged" PCs are at the highest risk because they lack subsequent Microsoft Store middleware updates.
- The root cause is indirectly linked to AI-enhancement components (Auto Super Resolution) used in Copilot+ PCs.
## Threat Actors
- **Not Applicable**: This is a software regression/functional bug introduced by official Microsoft patches (KB5121003) rather than a malicious campaign.
## TTPs
- **Update Regression**: The issue was introduced via the standard Windows Update deployment mechanism.
- **Error Profile**: Systems may report `EXCEPTION_ACCESS_VIOLATION` in scenarios involving specific hardware drivers or background AI packages.
## Affected Systems
- **Hardware**: ARM-based Windows devices (e.g., Surface Laptop 7, Surface Pro 11).
- **Operating System**: Windows 11 version 24H2.
- **Software**: Microsoft Teams, New Outlook for Windows.
- **Patch Level**: Systems with KB5121003 (released August 11, 2026) or later.
## Mitigations
- **Auto Super Resolution Update**: Manually update the "Auto Super Resolution Package" via the Microsoft Store (Library > Get updates) to version 1.0.19.0 or later.
- **Store Updates**: Ensure all Microsoft Store applications are fully updated on newly imaged devices before deployment.
- **Workaround**: Use "Classic" Outlook or web-based versions of Teams/Outlook, as these versions are unaffected.
- **Permanent Fix**: Microsoft is currently developing a cumulative update to resolve the issue natively.
## Conclusion
While not a security breach, these stability issues represent a significant availability risk for organizations deploying ARM-based Windows hardware. IT administrators should prioritize updating the Auto Super Resolution Package in their base images to prevent widespread application failures in newly deployed Copilot+ PCs.