Outlook on Mac crashes when switching to calendar

Question

Outlook on Mac crashes when switching to calendar

SSVan 5

My outlook app (version up to date) on Mac works fine until I switch to my calendar. I can navigate through the settings, send emails and basically do everything I need until the minute i switch to calendar. Any advice? Below is the error message popping up upon crash. Both MaciOS and outlook versions are up to date.

Microsoft Error Reporting log version: 2.0

Error Signature:

Exception: EXC_CRASH (SIGTRAP)

ExceptionEnumString: 50331648

Exception Code: 0x00000001 (0x0000000000000000)

Date/Time: 2026-05-27 19:48:12 +0000

Application Name: Microsoft Outlook

Application Bundle ID: com.microsoft.Outlook

Application Signature: OPIM

Application Bitness: x64

Application Version: 16.109.1.26051717

Crashed Module Name: merp

Crashed Module Version: 16.109.26051717

Crashed Module Offset: 0x0000000000004928

Blame Module Name: OlkCalendarUIKit

Blame Module Version: 16.109.26051717

UnsymbolicatedChecksum: B8421A7C38FE81A002BA1EB9512B0767

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_000000016f8c8b90

Crashed thread: 0

Dan Berry 0 Reputation points

2026-06-03T19:11:47.7466667+00:00

I have no less than a dozen users on Mac experiencing this exact same error when accessing calendars. Some get it right away, some get it after accessing other calendars... but it's always when manipulating the Calendar. Rebuilding the profile does not help. So far I've had to point them to Outlook Web or going back to Legacy Outlook. This all started occurring right after the May 26th Office update was pushed out.
Hornblower409 9,145 Reputation points

2026-06-04T07:11:06.16+00:00

@Dan Berry said

experiencing this exact same error when accessing calendars

This thread is not being worked by anyone. You need to start a new thread using the "Ask a question" button at the top of this page to create a new Question. This provides much higher visibility to your issue than commenting on this post (You can put the link for this page in your new Question for reference)

Or contact Microsoft Support directly:

Mac In App Support
https://support.microsoft.com/en-us/office/contact-support-within-outlook-for-mac-d0410177-8e65-4487-93f7-206a3a3d71a8

1 answer

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Dan Berry 0 Reputation points

2026-06-03T19:11:47.7466667+00:00

I have no less than a dozen users on Mac experiencing this exact same error when accessing calendars. Some get it right away, some get it after accessing other calendars... but it's always when manipulating the Calendar. Rebuilding the profile does not help. So far I've had to point them to Outlook Web or going back to Legacy Outlook. This all started occurring right after the May 26th Office update was pushed out.
Hornblower409 9,145 Reputation points

2026-06-04T07:11:06.16+00:00

@Dan Berry said

experiencing this exact same error when accessing calendars

This thread is not being worked by anyone. You need to start a new thread using the "Ask a question" button at the top of this page to create a new Question. This provides much higher visibility to your issue than commenting on this post (You can put the link for this page in your new Question for reference)

Or contact Microsoft Support directly:

Mac In App Support
https://support.microsoft.com/en-us/office/contact-support-within-outlook-for-mac-d0410177-8e65-4487-93f7-206a3a3d71a8

Answer 1

The crash occurs when Outlook loads the calendar UI (Blame Module: OlkCalendarUIKit). The available guidance for Outlook for Mac stability issues focuses on keeping both macOS and Outlook fully updated and, if issues persist, using workarounds or alternative clients until a fix is available.

Follow these steps:

Confirm Outlook is on the latest build
- In Outlook for Mac, go to Help > Check for Updates to open Microsoft AutoUpdate.
- Install all available updates for Outlook and the rest of Microsoft 365 for Mac.
- If already on the latest version, re-run AutoUpdate to ensure no partially applied updates.
Ensure macOS is fully updated
- Update macOS using the standard Apple process (System Settings/Software Update) or through the organization’s software distribution process.
If crashes persist after updating
- Use Outlook on the web as a temporary workaround for calendar access until a client-side fix is released.
- Monitor the Outlook for Mac “Fixes or workarounds for recent issues” and release notes pages for mentions of calendar-related crash fixes and install any newer builds as they become available.

If the problem continues even on the latest builds, collect the Microsoft Error Reporting logs and contact Microsoft Support or post in the Outlook Tech Community/Answers forums so the crash can be investigated and addressed in a future update.

References:

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Outlook on Mac crashes when switching to calendar

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