You can try MacMister MBOX Converter Tool to transfer MBOX files with emails into Office 365 directly with attachments on Mac & Windows. The software is easy-to-use and simple. It is programmed with a user-friendly interface which is manageable by all professional and novice users effortlessly. Moreover, with Office 365, there are 15+ saving options available which can be used to import MBOX emails. The tool has plentiful features that can be reviewed by utilizing free demo version.
Know more – https://www.macmister.com/mbox/