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Last Updated: May 11, 2020


Outlook for Office 365 fails to open .msg and .oft template files when Outlook is running.  If Outlook is closed the files will open.  The issue occurs after installing the Windows Updates listed below.  

Original Update

Replaced by

Windows 10, version 1909


KB4549951; KB4550945

Windows 10, Version 1903



Windows 10, version 1809



Windows 10, version 1803



Windows 10, version 1709



When this happens, a crash event is logged to the Windows Event Viewer Application Log:

Faulting application name: OUTLOOK.EXE, version: 16.0.11929.20648, time stamp: 0x5e5dcedb
Faulting module name: OLMAPI32.dll_unloaded, version: 16.0.11929.20602, time stamp: 0x5e3b26c9
Exception code: 0xc0000005
Fault offset: 0x000be59e
Faulting process id: 0x3acc

Other symptoms that may be related to this issue:

  • Opening .eml and .ics files may also fail to open and trigger the crash event.

  • mailto: links on a SharePoint page do nothing when clicked.

  • Some links may not be clickable and might be related to the mailto: links.

  • Sending emails directly from Word or Excel using the File -> Share -> "Attach a copy instead" may error with "Word couldn't send the email because of a MAPI failure: "Unspecified Error"".

  • Outlook Jump List Tasks may not be actionable


This issue is fixed in the following updates:

Current Channel, Version 2004 (Build 12730.20236).  

Monthly Enterprise Channel, Version 2003 (Build 12624.20588), May 12th public update.

Semi-Annual Enterprise Channel (Preview), Version 2002 (Build 12527.20612), May 12th public update.

Semi Annual Enterprise Channel, Version 1908 (Build 11929.20776), May 12th public update.

Semi Annual Enterprise Channel, Version 1902 (Build 11328.20578), May 12th public update.

Fixes for Outlook 2013, Outlook 2016, & Outlook 2019 Perpetual Versions are anticipated for the June 9th public update.


Until the fixed version becomes available it may be possible to mitigate the issues by disabling the Windows 10 User Experience Virtualization Service (UEV).  You can test this workaround by opening Task Manager and disabling the UevAgentService on a workstation experiencing the issue.  

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See Also

Fixes or workarounds for recent issues in Outlook for PC

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