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outlook data files

eric morrison 20 Reputation points
2026-02-03T17:40:02.5433333+00:00

my outlook seesm to have rearranged/changed by data file name

what should it be

outgoing is working well

Outlook | Windows | Classic Outlook for Windows | For home
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  1. Brian Tillman 25,465 Reputation points Independent Advisor
    2026-02-03T19:17:47.9833333+00:00

    Please explain the details of what you are seeing. Why do you think a file name has changed? What file are you referring to?

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  2. eric morrison 20 Reputation points
    2026-02-03T17:47:23.6866667+00:00

    how do i do that while not losing all my files before the issue arose?

    I want to go back to what it was. The default?

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  3. eric morrison 20 Reputation points
    2026-02-03T17:45:11.5866667+00:00

    how do i do that while not losing all my files before the issue arose?

    I want to go back to what it was. The default?

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  4. AI answer

    2026-02-03T17:40:11.78+00:00

    If your Outlook data file name has changed or appears rearranged, it may be due to the creation of a new .ost file or changes in your Outlook profile. By default, Outlook creates an Outlook.ost file for local caching, and if there is already an existing .ost file, Outlook may append a number to the file name (e.g., Outlook0.ost, Outlook1.ost).

    To check the current data file being used:

    1. Open Outlook.
    2. Click on the File tab.
    3. Select Account Settings, then click Account Settings again.
    4. Go to the Data Files tab to see the list of data files and their locations.

    If you need to ensure that your Outlook is using the correct data file, you can set your Exchange account as the default delivery location, which typically uses an .ost file. If you are experiencing issues, you may also consider creating a new Outlook profile or repairing the existing one.

    For further assistance, you can refer to the troubleshooting guides provided by Microsoft.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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