Table of Contents
- What Should You Do If Outlook Keeps Crashing After the June 2025 Office Update?
- Detailed Problems and User Reports
- Outlook 2021 LTSC
- Outlook 2016
- Outlook 2019 LTSC
- Office Documents:
- Possible Causes
- Workarounds and Recommendations
- Solution 1: Temporary Fix for Outlook Crashes
- Solution 2: For Document Loading Issues
- Solution 3: Monitor Microsoft Support
- Key Takeaways
What Should You Do If Outlook Keeps Crashing After the June 2025 Office Update?
The June 2025 Microsoft Office security updates addressed major vulnerabilities (CVE-2025-47162, CVE-2025-47164, CVE-2025-47167, CVE-2025-47953) with high severity (CVEv3 score 8.4). Despite closing critical security gaps, these updates have caused significant disruptions in corporate environments:
- Office documents fail to open in desktop applications.
- Microsoft Outlook Classic experiences frequent crashes, especially in Office 2021 LTSC and Office 2016.
- Outlook 2019 LTSC crashes when opening certain emails (e.g., Viva Engage, Yammer, Power Automate).
Detailed Problems and User Reports
Outlook 2021 LTSC
Crashes when double-clicking or creating new emails. No crash logs in the event viewer. Rolling back to build 14332.21040 resolves the issue but removes security patches.
Outlook 2016
Similar crashes reported, particularly after installing update KB5002683 (linked to CVE-2025-47171). Only some users are affected, and the crashes can occur sporadically.
Outlook 2019 LTSC
Microsoft support acknowledges crashes when opening specific types of emails. Recommended workaround is to use Outlook Web Access (OWA) or the new Outlook app.
Office Documents:
Files saved in locations like the Downloads folder may not open in Office apps. However, they can still be accessed via Office Online. Users must manually allow access in file properties (right-click, Properties, Security tab, check “Allow”).
Possible Causes
Update KB5002683 is identified as a key trigger for Outlook 2016 crashes. The new security settings may restrict access to files downloaded from the internet or email, requiring manual permission changes. The issues are not caused by Windows Defender SmartScreen.
Workarounds and Recommendations
Solution 1: Temporary Fix for Outlook Crashes
Roll back to the previous Office build if stability is critical, but be aware this removes security fixes.
For Outlook 2019 LTSC, use OWA or the new Outlook app until a permanent fix is released.
Solution 2: For Document Loading Issues
Right-click the affected file, select Properties, go to the Security tab, and check “Allow” before opening in Office.
Solution 3: Monitor Microsoft Support
Stay updated on official patches or hotfixes addressing these problems. Report issues through your IT department or directly to Microsoft for tracking and resolution.
Key Takeaways
- The June 2025 Office updates are essential for security but can disrupt daily operations due to application crashes and document access restrictions.
- Workarounds exist, but they may impact workflow efficiency or security posture.
Continuous monitoring for official updates and clear internal communication is crucial for IT teams managing Office deployments.