I recently needed to move multiple MBOX files into Microsoft 365 and found an easy solution like the Softaken MBOX to Office 365 Migration Tool. It helped me transfer all emails, attachments, folder and other mailbox data without any trouble. It supports bulk migration which saved a lot of time, and it keeps the original folder structure intact. Its simple interface makes it simple for non-technical users. I also liked that it works with all MBOX email clients like Thunderbird, Apple Mail and Entourage. If you want a safe and quick way to import MBOX to Microsoft 365 this tool is worth trying.