To transfer PST to MBOX manually, first, import the PST file into Outlook and then export it to a compatible email client like Thunderbird using IMAP configuration. This method requires technical steps and might not retain data integrity. For a reliable and quick solution, use the BLR PST File Converter Software, which ensures seamless conversion of PST to MBOX while maintaining folder structure and data accuracy. This tool is user-friendly and designed for hassle-free results.