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Connect archive.pst file to New Outlook

SteveK 0 Reputation points
2026-03-23T00:52:15.3533333+00:00

Had to re-install my MS 365 on a PC. Was using Classic Outlook prior to the re-install. Installation process installed New Outlook. Attempting to connect my archive.pst file. Followed instructions provided by MS. (Settings --> General --> Outlook Data Files). Issue is that there is not an "Outlook Data Files" in the General pick list. I have checked 2 other You Tube videos and they provided the same steps. The MS 365 tool is licensed to me. I also looked at "Files" in Settings. When I select the "Outlook Data Files", the message "Outlook Data Files requires a Microsoft 365 subscription. Add subscription account". When I select "Add subscription account", I do see my email address and confirms that the information is correct.

So wondering if anyone has experienced/seen this issue. If yes, how was it resolved.

Outlook | Windows | New Outlook for Windows | For home
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  1. Alice-N 10,280 Reputation points Microsoft External Staff Moderator
    2026-03-27T04:42:36.66+00:00

    Dear SteveK, 

    I understand you reinstalled Microsoft 365, are now on the new Outlook for Windows, and you’re unable to connect your archive.pst because Outlook Data Files is missing and you see “Outlook Data Files requires a Microsoft 365 subscription”, even though you’re licensed. 

    A few important notes about new Outlook and .pst files: 

    When a .pst can be opened in new Outlook 

    • Classic Outlook must also be installed, and both classic and new Outlook need to be the same architecture (both x86 or both x64). 
    • You must be signed into new Outlook with the Microsoft 365 account that has an active subscription. 
    • .pst is not supported on the ARM version of new Outlook. 
    • New Outlook cannot be in Safe/Recovery mode when opening a .pst. 

    Importing vs. opening 

    Quick checks: 

    • In new Outlook: go to Settings > Files > Outlook Data Files and try again. 
    • If you still see the subscription prompt, confirm the signed-in account in new Outlook is the same licensed account. 
    • Verify classic Outlook is installed on the PC and that its 32/64‑bit architecture matches new Outlook. 
    • If you want to import (not just open/read) the archive, switch to classic Outlook and run the import there. 

    Thank you for your understanding and time. Have a lovely day! 

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  2. AI answer

    2026-03-23T00:52:30+00:00

    New Outlook can open .pst files, but only when all documented requirements are met. In this case, the behavior matches the documented limitations and subscription requirements.

    Key points and checks:

    1. Confirm a qualifying Microsoft 365 subscription in New Outlook
      • New Outlook requires that the signed-in account be backed by a Microsoft 365 subscription to use Outlook Data Files.
      • The error “Outlook Data Files requires a Microsoft 365 subscription. Add subscription account” indicates New Outlook does not see the current profile as a valid subscription account, even if the email address looks correct.
      • Ensure the account in New Outlook is the same Microsoft account (or work/school account) that owns the Microsoft 365 subscription, as described under the Requirements section. If the subscription is tied to a Microsoft account that uses a third‑party email (Gmail/Yahoo), follow the guidance in “Connecting a subscription purchased with a Microsoft account to Outlook.”
    2. Verify architecture and classic Outlook installation
      • New Outlook can only open .pst files if classic Outlook is also installed and both are the same architecture (32‑bit or 64‑bit):
        • 64‑bit machine → 64‑bit classic Outlook and 64‑bit new Outlook
        • 32‑bit machine → 32‑bit classic Outlook and 32‑bit new Outlook
      • If classic Outlook is not installed, or is a different bitness, the Outlook Data Files feature in New Outlook will not function correctly. Install classic Outlook using the guidance in “Install classic Outlook for Windows,” making sure to match the architecture.
    3. Check other New Outlook requirements
      • Outlook Data Files (.pst) are not supported with the ARM version of New Outlook.
      • New Outlook cannot be in Safe or Recovery modes when using .pst support.
    4. Workaround: use classic Outlook directly
      • Importing from a .pst into a mailbox is not supported in New Outlook. For any import (rather than just viewing/searching the .pst), classic Outlook must be used:
        1. Open classic Outlook.
        2. Go to File → Open & Export → Import/Export.
        3. Choose “Import from another program or file” → “Outlook Data File (.pst)”.
        4. Browse to the archive.pst and complete the wizard to import into the desired mailbox or folder.
      • Alternatively, in classic Outlook, open the .pst (File → Open & Export → Open Outlook Data File) and drag/drop items instead of importing.
    5. Once prerequisites are met, open the .pst in New Outlook
      • After confirming: (a) valid Microsoft 365 subscription recognized in New Outlook, (b) matching-architecture classic Outlook installed, and (c) not on ARM or Safe/Recovery mode:
        1. In New Outlook, go to Settings → Files → Outlook Data Files.
        2. Select “Add file”.
        3. Select archive.pst and choose Open.
      • New Outlook will then allow reading and searching the .pst contents.

    If the subscription is valid and classic Outlook is correctly installed but New Outlook still shows the subscription error, the practical resolution is to use classic Outlook for all .pst operations (open/import) until the account/subscription association is corrected per the “Connecting a subscription purchased with a Microsoft account to Outlook” guidance.

    References:

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