Cannot Open Outlook After Update

Robert Pregulman 0 Reputation points
2026-09-19T16:49:27.4333333+00:00

After an Outlook for Mac update, Outlook stopped working. When I clickthe Outlook icon, it appears for a few seconds and then disappears. I can see all my emails and folders normally through Outlook.com in Safari. I need help repairing Outlook for Mac without losing my local Outlook data?

Outlook | MacOS | Legacy Outlook for Mac | For home
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  1. Hornblower409 15,140 Reputation points
    2026-09-21T00:38:00.1033333+00:00

    [Removed by author. Answer did not fit the circumstances of this question]

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  2. Chloe-V 12,790 Reputation points Microsoft External Staff Moderator
    2026-09-20T04:18:35.81+00:00

    Hi @Robert Pregulman

    I’m sorry Outlook stopped opening after the update. Since your mailbox is still available in Outlook.com, please avoid deleting your Outlook profile or using Reset Account for now, as unsynchronized local data may be removed.

    First, quit Outlook and back up this folder:

    ~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/

    Then open another Office app, select Help > Check for Updates, install all available Office updates, restart your Mac, and try Outlook again.

    If Outlook still closes immediately, open Applications, right-click Microsoft Outlook, select Show Package Contents > Contents > SharedSupport, and open Outlook Profile Manager. Create a temporary profile and set it as the default, but do not delete the original profile. If Outlook opens with the temporary profile, add your account and allow the mailbox to sync from the server.

    Please let us know whether Outlook opens with the temporary profile.


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