What's the Difference Between Outlook's PST and OST Files? - How-To Geek
https://www.howtogeek.com/690076/whats-the-difference-between-outlooks-pst-and-ost-files/
webOct 6, 2020 · OST files automatically synchronize with the email server, as long as you have an internet connection. Unlike PST files, though, you can't import an OST file into Outlook---because you don't have to. If you're setting up Outlook on a new machine and connecting to your email account via IMAP or MAPI, all of your emails will be on the server, and ...
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