To Migrate MBOX to Office 365 without any manual method, you need to use a third-party tool; I would like to recommend Shoviv MBOX to Office 365 Migrator tool highly. That can easily export multiple MBOX files into Office 365 mailboxes, archive mailboxes, and public folders in a more precise way. This tool allows a user to export MBOX to PST, Live Exchange, and Office 365. If you want a reliable and genuine MBOX tool, try a demo version of this tool, which allows migrating/converting the first 50 items/folder.

Key Features of Shoviv MBOX Migrator tool:-

  1. Allow adding multiple MBOX files and folders.
  2. Users can Preview MBOX email items.
  3. Convert MBOX to PST, EML, and MSG file format.
  4. Migrate MBOX to Office 365, Live Exchange, and Outlook profile.
  5. Allow items filtration for more customizable migration.
  6. Export the first 50 items for each folder.

For more info, visit here:- MBOX to Office 365 Migration tool