How do I take a backup from OST to PST?

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To back up Outlook data from an OST file to a PST file you need to use a reliable method since OST files cannot be directly imported into Outlook. The best way is to use the professional tool like DataVare OST to PST Converter Expert which allows you to export emails, contacts, calendar entries, and other mailbox items safely. if the OST file is orphaned or inaccessible, it is the most effective solution.