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After that, sign in with the same Gmail id that you used in Thunderbird.Now, open Microsoft Outlook and Sign In with essential credentials.Sign In to MS Outlook using Gmail IMAP Account.Wait for a while so that the Thunderbird syncs the copied emails to the Gmail server.After that, copy all Thunderbird emails from a specific folder you want to move to the Gmail folder.Define a name and from Create as a subfolder of and select your Gmail Account.Right-click on the created folder and opt with the New Subfolder option.When you successfully Sign In to your account, generate a new folder that you configured your Gmail account in Thunderbird.Copy Thunderbird Mailbox Emails into Gmail Folder.After that, tap on the Allow less secure app access to turn on the feature.Īfter you perform the changes, Sign In to Thunderbird using Gmail credentials.Click on th e Enable option for Less secure app access.After that, click on the Turn Off button to disable 2-Step authentication.Now, enter your password again to check.Firstly, Sign In and then press 2-Step Authentication.Steps to disable 2-Step authentication in your account
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Implement the below steps if you fail to Sign In to Thunderbird:
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Troubleshoot Thunderbird Gmail Sign In Error Moreover, in case you are facing sign In errors, follow the procedure guide below on Gmail sign-in issue.
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