Yes, you can import an OST (Offline Storage Table) file into Outlook, but with certain considerations. OST files are essentially offline copies of your mailbox that Outlook creates to allow you to work offline. The primary purpose of OST files is to enable you to access your mailbox data even when you are not connected to the Exchange server. For that, you need to convert OST to PST file and then import it into the Outlook interface. For efficient conversion, try the Advik OST Converter tool on your Windows 11, 10 and any other version.