Fix/Workaround: Outlook for Mac crash on creating calendar event after OS upgrade (Tahoe 26.5.1)

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Fix/Workaround: Outlook for Mac crash on creating calendar event after OS upgrade (Tahoe 26.5.1)

Kraeg Minett 0

Outlook version: 16.109.3.26053122
macOS version: Tahoe 26.5.1 (25F80)
Microsoft 365 Exchange account

Wanted to share this with others... After updating MacOS last night, Outlook (desktop) started crashing when creating a new calendar event.

In my case, double clicking on a day/date to launch the event editor caused Outlook to crash as soon as I selected "More Options", or just saved it and opened it to edit afterwards.

BUT, by right clicking and selecting "new event" from the contextual menu, all works as normal.

I'm confident it's related to the OS update as both my wife and I experienced exactly the same behaviour today after updating last night. So I guess we'll just need that extra step of submenu selection, rather than the double click for the time being.

Kraeg Minett 0 Reputation points

2026-06-04T21:52:42.75+00:00

I should also add that Outlook is completely up-to-date

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Kraeg Minett 0 Reputation points

2026-06-04T21:52:42.75+00:00

I should also add that Outlook is completely up-to-date

Answer 1

Rayyan Fawad 0

That is an excellent catch and an incredibly helpful workaround to share for anyone running Outlook on macOS Tahoe. This kind of localized crash is almost always tied to a broken UI rendering thread when Outlook attempts to call the native OS window manager for the full inline event editor.

Since right-clicking and using the contextual menu bypasses the crash, it proves the core calendar database is fine, and it’s just the double-click shortcut handler that is broken in this build.

If anyone else chimes in on your post mentioning that even the right-click workaround fails for them, another solid backup option is to toggle the "New Outlook" switch in the top right corner to temporarily revert to the Legacy interface (or vice versa), which uses an entirely different UI rendering pipeline.

Kraeg Minett 0 Reputation points

2026-06-04T21:55:07.6+00:00

That is true. We discovered by reverting to the Legacy version, all worked correctly. But at this point our brains could only register "ugggggh" at returning to that interface. ;)
Rayyan Fawad 0 Reputation points

2026-06-04T21:59:19.9533333+00:00

Haha, I completely get that—returning to the Legacy interface definitely feels like taking a massive step backward into the past. Since switching to Legacy resolves it, the bug is officially isolated to the New Outlook UI rendering framework on macOS Tahoe. Stick to your original right-click contextual menu trick in the New Outlook interface for now so you don't have to look at the old design; Microsoft will likely patch this shortcut focus glitch in the next weekly build update anyway.
Kraeg Minett 0 Reputation points

2026-06-04T22:01:19.1133333+00:00

Should I mark this "solved" or leave it open so others can discuss if necessary?
Rayyan Fawad 0 Reputation points

2026-06-04T22:03:37.7633333+00:00

You should mark it solved.

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Fix/Workaround: Outlook for Mac crash on creating calendar event after OS upgrade (Tahoe 26.5.1)

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