Installing and configuring Thunderbird to import Mbox files into Google
Email accounts can be exported on many platforms in MBOX format. The free software product Thunderbird can be used to import MBOX files in a Gmail account .
Step-by-step guide
Download Thunderbird from Mozilla’ website https://www.thunderbird.net/
Run the executable file
Standard radio button > Next
Uncheck Use Thunderbird as my default mail application > Install > Finish
Enter Full Name - New Email address > Password
IMAP radio button > Done
With Thunderbird open - click the Hamburger button > Addons and Themes
In the search field type: ImportExportToolsNG
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