You can use the Yota Thunderbird Migrator Tool, this tool easily import Thunderbird to Gmail with no data limits or file size. It allows users to choose the specific filter options to import Thunderbird to Gmail according to their needs, like contacts, sender, calendars, etc. This is the best tool that handles the whole process; it doesn’t need any external application to complete the migration process. Plus, this software provides the users with the assurance that all data is preserved, and the data hierarchy is maintained during the migration process. This software can be easily installed on any Windows operating system, including Windows 11, 10, etc.
I preferred this solution. There is also a manual solution available to import Thunderbird emails to Gmail, but the manual process is time-consuming and lengthy. You have to acquire some technical knowledge to use the manual configuration.
I preferred this solution. There is also a manual solution available to import Thunderbird emails to Gmail, but the manual process is time-consuming and lengthy. You have to acquire some technical knowledge to use the manual configuration.