For Windows users seeking the best option to migrate Thunderbird to Google Workspace, I am going to recommend the CloudMigration Thunderbird Backup Tool. It's very simple to work with and eliminates the need to complete any manual setup like MBOX files or IMAP settings. The tool automatically locates your Thunderbird profile, has direct migration to Gmail (which works seamlessly with Google Workspace), gives you the ability to apply filters, like date range or excluding attachments, prevents duplicate emails, and has bulk migration options, which is what saved me so much time. This has been, without a doubt, one of the smoothest tools I have ever worked with when transferring mail.

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