Free Outlook not working on Mac Tahoe 26.7

Jorge Garcia 25 Reputation points
2026-09-17T15:05:24.6633333+00:00

I am on a Macbook Pro running Tahoe 26.7. I woke up and my outlook client looks completely different and is offline. If i try to bring it back online, it asks me to either sign in with an office 365 subscription or start a free trial. I have uninstalled outlook and installed it back again. Nothing works. I have lost access to my mail through outlook.

Outlook | MacOS | New Outlook for Mac | For home

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  1. Victor Saldaña 10 Reputation points
    2026-09-18T07:54:48.8866667+00:00

    What I did to continue using the app: I did a backup from the folder:
    '~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles' renaming adding a .bak to the folder.
    After that I uninstall Microsoft Outlook. I installed the previous version of Microsoft Outlook from here: (16.112) https://learn.microsoft.com/en-us/officeupdates/update-history-office-for-mac
    I opened the App. I closed the App. I replace the new Outlook 15 Profiles with the backed up....

    Now it works!

    I never install again any update until Microsoft ensures this bug is fixed....

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  2. Hornblower409 16,975 Reputation points
    2026-09-18T03:09:26.0533333+00:00

    Outlook for Mac 16.113 - MS 365 subscription prompt and other problems.

    • Prompted for a Microsoft 365 subscription
    • Can not switch out of Legacy mode
    • Outlook stuck offline

    See the Answer by "Hornblower409 Sep 17, 2026" in
    https://learn.microsoft.com/en-us/answers/questions/6006979/free-outlook-not-365

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  3. Diane Poremsky MVP 17,636 Reputation points MVP Volunteer Moderator
    2026-09-17T21:19:08.9733333+00:00

    Had you switched it over to legacy mode? You need to use new Outlook with the free version - you would need a license for the legacy version.

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