Export batch MBOX files into Gmail Account
Use CubexSoft MBOX to Gmail Converter software to convert multiple MBOX files in batch mode at once. This software maintains data integrity throughout the migration process. The utility has a very easy-to-use interface that non-technical users can easily import their MBOX files to Google workspace without any difficulties. And this utility also Supports both Windows OS and Mac OS. The software allows the migration of MBOX files associated with 20+ emails applications into Gmail. Some supported applications that create MBOX files are Mozilla Thunderbird, Entourage, Eudora, Opera Mail, Cone, Apple Mail, and many more. And this software comes with a free demo edition so you can understand the software easily.
Read more: https://www.cubexsoft.com/mbox-to-gmail/
Read Also: https://www.cubexsoft.com/blog/how-to-transfer-mbox-mailbox-to-google-workspace/

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Joy Hopson commented
If you want to migrate data from MBOX to Gmail, I'd like to suggest you use eSoftTools MBOX Converter Sodftware. With this tool, all users can easily all their important emails from multiple MBOx files to Gmail in a single process. This tool's user interface is simple and easy and any user can access it with no problem. A demo edition of the tool is also available for every user to perform quick migration free of cost.
Know More:- https://www.esofttools.com/mbox-converter.html