Overview
A critical bug in Microsoft Outlook Version 2412 is causing widespread crashes during email composition, affecting enterprise productivity across multiple Outlook versions. The issue triggers 0xc0000005 exception codes in Version 2412 (Build 18324.20168)
Whom it may concern
- IT Administrators managing Microsoft 365 environments
- Enterprise users of Outlook 2016-2021
- Microsoft 365 subscribers
- Windows Server 2016/2019 system administrators
Key Findings
- Crash occurs when writing, replying to, or forwarding emails
- Temporary workaround available through version rollback
- Permanent fix scheduled for January 28th in Version 2501
- Affects multiple Outlook versions: 365, 2021, 2019, and 2016
Action Items
- Implement temporary fix by rolling back to version 2411 (Build 18227.20162)
- Monitor Windows Event Viewer for Event 1000/1001 crash signatures
- Plan maintenance window for January 28th update
- Document affected systems for future reference
Sources
- [BleepingComputer](https://www.bleepingcomputer.com/news/microsoft/microsoft-shares-temp-fix-for-outlook-crashing-when-writing-emails/)
