Major Global Crash Surge in Microsoft Word (winword.exe Build 16.0.19029.20244) Linked to mso20win32client.dll

ControlUp’s global crash anomaly detection has surfaced a significant spike in Microsoft Word instability tied specifically to build 16.0.19029.20244. The crashes originate from the module mso20win32client.dll and have risen sharply across hundreds of organizations.

All analysis is based solely on anonymized telemetry and aggregate metadata — even at that level, the trend is unmistakable.



This build of Word is experiencing a sudden, dramatic increase in crash frequency:

• Baseline: 500–600 crashes/day
• Current: ~30,000 crashes/day
• Impacted organizations: 500+
• Impacted devices: 15,000+

Several large enterprises are severely affected The spike occurred abruptly, not gradually. There is minimal public awareness — no official Microsoft advisory has been released, and only isolated references (including a Reddit thread where MS Support acknowledges the issue) are currently available. Many IT teams may be seeing user tickets or rising crash rates without recognizing the root cause.



1. Check your environment’s crash trend for WINWORD.EXE

   Use the following link and replace org_name with your tenant name:

   https://app.controlup.com/org_name/dashboards/dashboard/312636d2-3969-425c-8e32-6960e1e224c5?range=30d&v=Application%3DC%253A%255CProgram%2520Files%255CMicrosoft%2520Office%255Croot%255COffice16%255CWINWORD.EXE

2. If affected, open a case with Microsoft Support

   Broader customer reporting increases visibility and accelerates remediation on Microsoft’s side.

3. Share any findings or Microsoft responses back with the community

   Correlation data — plugins, policies, drivers, system profiles — helps validate the issue faster.

This incident underscores why ControlUp’s global dataset and anomaly-detection capabilities are so valuable: early identification of widespread, high-impact issues before formal advisories are issued.

If you’re seeing Word crashes, unexpected closings, or instability in build 16.0.19029.20244, please share your observations.