GainTools OST to PST Converter is the best and most powerful OST file recovery and conversion tool for users who need to recover inaccessible or corrupted OST data and convert it into a usable Outlook PST file. It offers mailbox preview, selective folder export and support for emails, contacts, calendars, notes and tasks. The option to check recoverable data before conversion makes the process more convenient, especially when working with a problematic OST file. Overall, it is a practical choice for OST recovery and mailbox migration.