Exporting OST data to an Outlook PST file is a useful way to back up mailbox information and migrate emails, contacts, calendars, tasks, and other Outlook items. An OST file is normally associated with an Exchange or Microsoft 365 account, while PST is a portable Outlook data file that can be opened or imported into another Outlook profile.
To export accessible OST data, open Microsoft Outlook and make sure the associated account is synchronized. Go to File > Open & Export > Import/Export, select Export to a file, and click Next. Choose Outlook Data File (.pst) and select the mailbox folders you want to export. Enable Include subfolders if you want to include all nested folders. Select a destination location, provide a suitable PST filename, and finish the export process.
This method exports mailbox data available through the Outlook profile rather than directly converting a standalone OST file. If the OST file is orphaned, corrupted, inaccessible, or disconnected from its original Exchange account, Outlook may not be able to export its contents. In such cases, specialized OST to PST converter software can scan the OST file and extract available mailbox data. Depending on the tool, users can preview mailbox items and save emails, contacts, calendars, tasks, and other data into a PST file for backup or migration.
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