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To import MBOX files to an Office 365 account, you can utilize the built-in import feature provided by Office 365. First, ensure you have access to your Office 365 account and the necessary permissions to import emails. Then, navigate to the Exchange admin center within the Microsoft 365 admin center. From there, select "Recipients" and then "Migration." Next, choose the option to "Import PST file." Follow the prompts to upload the MBOX files to your Office 365 mailbox. You'll need to map the mailboxes in the MBOX files to the corresponding Office 365 mailboxes to ensure emails are imported correctly. Once the mapping is complete, start the migration process, and Office 365 will begin the process to import MBOX to Office 365 mailbox. Monitor the migration progress through the Exchange admin center, and once complete, verify that all MBOX emails have been successfully imported into your Office 365 account.