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Mailboxes not showing in old version outlook 365 on mac

Ivan Djakie 0 Reputation points
2025-12-06T01:47:05.0933333+00:00

So i have a lot of email messages in outlook that i need. I moved to another hosting provider and restoring a backup is not an option. The emails als older then 5 years.

Using the older version of outlook should be the soluition, but i dont see any mailboxes in the older version. When i search for some attachments from the emails, i can find them in different submaps from:
/Users/macbook/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles/Main Profile/Files/S0

So i know the emails are still there. When i switch to the new version of outlook i can see all my mailboxes, but the one with the old settings from the old previous hosting provider doesn't have any messages.

How can i fix this problem?

I really need those email messages, so i can export them and import them to the new hosting provider.

Kind regards
[Moderator note: personal info removed]

Outlook | MacOS | Legacy Outlook for Mac | For business
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  1. Vergil-V 7,550 Reputation points Microsoft External Staff Moderator
    2025-12-06T08:50:43.2166667+00:00

    Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data.  

    Hi @Ivan Djakie 
    Thank you for contacting the Microsoft Q&A forum.  
    I understand how important it is to access and export your mailbox data, especially since your emails are over five years old and you need them for migration to a new hosting provider. 

    To better assist you, could you please clarify the following: 

    • What is the account type of the affected mailbox: POP, IMAP, or Exchange? 

    From my research: 

    • Exchange or IMAP accounts usually sync with the server, meaning your data should be stored online. 
    • POP accounts, however, store emails locally under the folder “On My Computer. undefined

    If the On My Computer folder is hidden, you can enable it to check whether any messages are stored there. undefined

    Also, if you have more than one Outlook profile or identity, please make sure you select the one that contains the old local data. You can set the default profile by following the steps in this article: Manage profiles or identities in Outlook for Mac - Microsoft Support undefined

    If the issue persists, for visual confirmation, could you share a screenshot showing that On My Computer is enabled in your legacy Outlook for Mac and what you currently see? Please send this via private message. Check your inbox for an email with the subject “New private message on Microsoft Q&A question” to review my response. 

    If your messages are stored in On My Computer, you can export them to an .olm file. For detailed guidance, refer to: Export items to an archive file in Outlook for Mac - Microsoft Support undefined

    I hope this helps! If you have any questions or need further assistance, feel free to reach out. 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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