Try the ConverterTools
Office 365 Converter tool to back up Office 365 emails to an External Hard Drive, Computer, PC, or Local Drive. It also allows the backup of Office 365 data to multiple file formats like PST, PDF, EML, MSG, MBOX, etc. You can simply migrate the Office 365 files to numerous email clients like Gmail, Yahoo Mail, Thunderbird, Hotmail, IMAP, Zoho Mail, and so on with attachments. Along with this, it provides the option to skip all the same Office 365 emails throughout the backup or migration process.