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dnberry
Copper Contributor
Jun 03, 2026

New Outlook for Macintosh Calendar Crashing

I've received word from no less than a dozen of my clients that they are getting crashes similar to the following whenever they start to view calendars (either their own or other shared calendars):

Error Signature: Exception: EXC_CRASH (SIGTRAP) ExceptionEnumString: 50331648 
Exception Code: 0x00000001 (0x0000000000000000) Date/Time: 2026-06-02 17:52:42 
+0000 Application Name: Microsoft Outlook Application Bundle ID: 
com.microsoft.Outlook Application Signature: OPIM Application Bitness: x64 Application 
Version: 16.109.3.26053122 Crashed Module Name: merp Crashed Module Version: 
16.109.26053122 Crashed Module Offset: 0x0000000000004928 Blame Module Name: 
OlkCalendarUIKit Blame Module Version: 16.109.26053122 UnsymbolicatedChecksum: 
90784EBBB8F0F0756139A717DBDA8150 Blame Module Offset: 0x000000000003aff0 
StackHash: df444cd1c97e732e_50331648_main_phx Application LCID: 1033 Extra app 
info: Reg=en Loc=0x0409 Build Type: Release Crashed thread Stack Pointer: 
0x_000000016dc5cb70 Crashed thread: 0

MacOS is up to date, and this all appears to have started after Office for Mac was updated on or after May 26's update.

We've tried resetting their profiles to no avail. Does anyone have any recommendations?

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