How do I bulk import multiple MBOX files to Office 365?
Bulk importing multiple MBOX files to Office 365 manually can take a lot of time, especially when dealing with large mailbox data. Many users prefer using the SysInfo MBOX to Office 365 Migration Tool because it supports bulk migration without file size limitations. You can add several MBOX files together, preview the content, and export everything directly to your Microsoft 365 mailbox. The software also gives options to migrate emails into Archive, Online, or Public folders. During the process, it keeps attachments, email formatting, and folder structure unchanged, which helps avoid confusion after migration.
Read more: https://www.sysinfotools.com/mbox-to-office-365-migration.php
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Alla crook commented
Import bulk MBOX files to Office 365 account with WholeClear MBOX to Office 365 Converter. This software helps in the easy migration of MBOX files to an Office 365 account. You can import several MBOX files into O365 as per your needs and preferences. The tool also keeps the whole folder structure of MBOX emails & securely uploads the same to the Office 365 account. It support 20+ email clients such as - Thunderbird, OperaMail, PocoMail, Apple Mail, etc.
Read More - https://www.wholeclear.com/mbox/office-365/