The best WholeClear OST to MBOX Converter Software is a simple and effective solution for converting Outlook OST files to MBOX format, making it easy to access your emails in clients like Thunderbird, Apple Mail, and others. The tool supports all types of OST files, including those from Exchange and IMAP accounts, and performs the conversion without requiring Microsoft Outlook. It preserves the original folder structure, email formatting, and attachments, ensuring complete data integrity. Designed for both personal and professional use, the software offers batch conversion, a user-friendly interface, and full compatibility with all Windows OS versions. A free demo version is available for testing. It supports all MS Outlook versions like 2021, 2019, 2016, 2013, etc. It converts OST files to MBOX format without using MS Outlook.