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How can I import a .ost file as a .pst file?

I have Office 365.   I had to install Windows 10.   I copied data file, I did not export it.  Now when I try to import through Outlook, it says it cant because it is an .ost file.   How can I import it as a .pst file?
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whats the size of the OST file? it's usually an offline folder for outlook.
You can use Exchange Power Shell  and Export mailbox directly from Exchange  to PST file then import it to Outlook

New-MailboxExportRequest -Mailbox USERNAME -FilePath "\\SERVER\Share\USER.pst"
Hi,

From outlook, goto:

File| Account settings|Data files|Add|

This will generate a root folder in outlook that you can personalize as you need.

Then, drag and drop msg from your inbox (or others) in the new folder.

This is in case  you don't have to many users.

In case of to many users you can script it in powershell.
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Thsnks for all the suggestions.   But as soon as I launched the reinstslled Outlook it redownloaded all the e-mails that were still on thre server.