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You can convert an OST file to PST manually using the Outlook Import/Export feature: Open Outlook → Go to File → Import/Export → Export to a File → Choose Outlook Data File (.pst) → Select folders → Save the PST file. However, the manual method has a drawback as it requires Outlook and does not work for orphaned or corrupted OST files. To overcome these limitations, you can use DRS Softech OST to PST Converter, which allows seamless OST to PST conversion without Outlook, supports bulk conversion, and ensures data integrity.