A safer approach is to use a dedicated solution like Sysinfo OST to PST Converter, which is designed to open OST files independently and convert them to PST while preserving original data structure. The tool scans the OST file, previews all mailbox items (emails, contacts, calendars, tasks, notes, and attachments), and allows you to export them into PST format without modifying the original file. Because it works in a read-only mode. Read more: https://www.sysinfotools.com/ost-to-pst-converter.php