Looking for a reliable way to import Thunderbird to Gmail? Then use the Yota Thunderbird Migration Tool. This tool easily migrates emails with no data limits or file size. It allows users to choose the specific filter options to import Thunderbird to Gmail Account according to their needs, like contacts, to, sender, calendars, etc. It is a standalone tool that handles the whole process; it doesn't need any external application to complete the migration process.
Steps to follow to migrate Thunderbird to Gmail:
Install and run the Thunderbird to Gmail Migration tool on your Windows PC.
Then, click on the Open menu from the top.
Next, click on Email Clients and choose Thunderbird Accounts.
Now click on Export and select Gmail as the target location.
Enter Gmail login credentials and hit the Save button.