Convert OST mailbox to Outlook PST file when you need to back up, migrate, or access mailbox data outside an Exchange environment. An OST file is generally linked to an Exchange, Microsoft 365, or IMAP account, while PST is a portable Outlook data file. To convert OST to PST, first locate the required OST file on your Windows computer. Then use a reliable OST to PST converter that can scan and preview mailbox data such as emails, contacts, calendars, tasks, and journals. Select the required folders or mailbox items and choose PST as the saving format. Start the conversion and save the resulting PST file to a preferred location. After conversion, open Outlook and use File > Open & Export > Open Outlook Data File to access the converted PST. For orphaned, inaccessible, or corrupted OST files, professional OST to PST conversion software can help recover mailbox data and export it to PST without requiring the original Exchange server connection.
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