Using New Outlook on Windows for personal email, calendar, and contact management
New Outlook only has limited support for .PST files at this time. Classic Outlook is what is needed here, please have a look at this article:
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I bought a new computer and Office 2015, but when I set up my Outlook, it tells me that Outlook data files require a Microsoft 365 subscription. It will not let me select the outlook.pst file that I transferred to the new computer. I have many folders with saved emails going back years, and I do NOT want them on OneDrive. I want them on my computer! How can I get Outlook to let me add the Outlook Data File with all my old saved emails?
Using New Outlook on Windows for personal email, calendar, and contact management
New Outlook only has limited support for .PST files at this time. Classic Outlook is what is needed here, please have a look at this article:
Hi, I'm John! I will help you with this.
You may be using the new Outlook for Windows, not the classic Outlook.
Microsoft recently added PST file support to new Outlook, but it has requirements. One of them is that the account signed into new Outlook must have a Microsoft 365 subscription. Microsoft also states that classic Outlook must be installed on the PC.
If you purchased a standalone Office/Outlook license (not Microsoft 365), that would explain why you see the message about requiring a Microsoft 365 subscription.
The good news is that your PST file does not need to be stored in OneDrive. PST files can remain on your local computer.
To help narrow down the issue:
If you have classic Outlook installed, the simplest solution may be to switch to classic Outlook and then open the PST file from there. Classic Outlook has long supported local PST files without requiring OneDrive storage.
Let me know which Outlook version you have and I can provide the exact steps.