You can manually import MBOX to Gmail with Thunderbird email client. But if you want upload MBOX to Gmail without Thunderbird then try Advik MBOX Converter tool on your system. The software can import single or multiple MBOX files at once without any data loss. It is able to upload MBOX emails in their original format without any single change. You can download its free version and import MBOX to Gmail in just a few simple clicks.
1. Run this tool on your system.
2. Add MBOX file.
3. Choose Gmail as saving options.
4. Enter Gmail login details.
5. Press Convert button.
Done!
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