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The easiest way to convert an OST file in Outlook 2021 is by using a professional OST to PST conversion tool. The software scans the OST file, previews mailbox content, and exports selected or complete data into PST format. It preserves email formatting, metadata, and folder hierarchy during the conversion process. The generated PST file is fully compatible with Outlook 2021 and can be imported without any complications. This solution is ideal for recovering inaccessible OST files, creating backups, and migrating mailbox data efficiently.