You can easily migrate MBOX to Office 365 using third party software Regaintechnologies MBOX to Office 365 Migrator tool. This Software Supports 20+ MBOX based email clients applications such as Apple Mail, Pocomail. Eudora, Spicebird, Entourage, Google takeout, Netscape, SeaMonkey, etc. This Software provides selective Migration feature where user can easily Select those files and folders which they want to Migrate. this Software supports all the version of Windows OS.