MBOX data files are stored in various email clients like Apple Mail, Thunderbird, Entourage, SeaMonkey, Netscape, etc. But users cannot import these MBOX files to Office 365 shared mailbox directly.
In this situation, third party tool helps a user and provide an easy way to migrate MBOX file to Office 365 shared mailbox. Opt MailsDaddy MBOX to Office 365 migration tool to open MBOX data file to O365 shared mailbox in a few easy clicks.
This professional tool runs on all Windows OS and easily migrates the mailbox into Office 365 account. You can also test the free demo edition of the software and convert 20 emails from each folder.
Read: Manually migrate MBOX to Office 365