MBOX file supports various popular email clients like Gmail, WebMail, Thunderbird, Apple Mail, Netscape etc. But any email client does not provide a direct way to import MBOX file to Office 365 account. Therefore we need a professional application like MailsDaddy MBOX to Office 365 migration tool. This single solution runs on all Windows OS and perform hassle-free migration from MBOX to Office 365 account without any hassle. You can also download the free demo version of the software and convert 20 emails from each folder. Read more: MBOX to Office 365 migration tool