The best OST to PST converter is EmailSoftwares OST to PST Converter tool. It provides a reliable and efficient solution for converting offline OST files to Outlook PST format. This tool supports the conversion of multiple OST files at once and can handle corrupted OST files. It exports all email data, including emails, calendars, contacts, tasks, and more, while preserving the integrity of your files. Additionally, it offers features like a preview before conversion, log report generation, and support for Unicode OST to PST conversion, making it a top choice for users seeking a comprehensive OST to PST conversion solution.