To convert OST to EML format on a Mac, you can use third-party tools like Recoveryfix OST to PST Converter. It tool allow seamless conversion of OST files into EML format, preserving the folder structure and email integrity. The tool migrates OST files to Office 365, Live Exchange, Outlook.com, Gmail, and other IMAP servers. Get info, visit to: https://www.recoveryfix.com/ost-to-pst-converter.html