I've been having trouble transferring MBOX emails from Apple Mail to my Office 365 account, but couldn't until I found this solution. Advik MBOX Converter is one of the useful approaches to transfer emails from Apple Mail MBOX files to your Office 365 account. Just install this software and add MBOX files to the software. Select the required email folder for MBOX file. Select Office 365 as the saving option. Enter your Office 365 account credentials and press the Convert button. This tool takes just a few minutes and import MBOX to Office 365 quickly.
Additionally, you can also use this tool to import MBOX to Gmail, Outlook.com, Zoho Mail, AOL Mail, Thunderbird, Yahoo Mail, MAP, etc. The program guarantees the preservation of the data hierarchy while converting your MBOX file into a variety of widely used file formats, including PDF, MSG, OLM, EML, PST, TXT, and so forth.
For more info: How to Export Emails from Apple Mail to Office 365? - Solved
Additionally, you can also use this tool to import MBOX to Gmail, Outlook.com, Zoho Mail, AOL Mail, Thunderbird, Yahoo Mail, MAP, etc. The program guarantees the preservation of the data hierarchy while converting your MBOX file into a variety of widely used file formats, including PDF, MSG, OLM, EML, PST, TXT, and so forth.
For more info: How to Export Emails from Apple Mail to Office 365? - Solved