If you want to Import/Migrate email from IMAP to Gmail accounts with the best third-party tool. Then I would like to suggest using eSoftTools IMAP Backup and migration Software. Using this tool you can smoothly Import/Migrate email from IMAP to Gmail accounts and many other formats. It provides multiple functions as well as a great use interface compared to other conversion tools. And it is easily operated by any technical and non-technical person.
Read more:- Import/Migrate email from IMAP to Gmail accounts
Read more:- Import/Migrate email from IMAP to Gmail accounts