Then sign in with same Gmail account that you used in Thunderbird.Now open Microsoft Outlook on your Windows or Mac (where you want to migrate Thunderbird mails)and sign in with your Outlook account.Step 4: Signin to Outlook using Gmail IMAP Account Wait for the Thunderbird to sync the copied emails to Gmail server.Then copy all your Thunderbird email folders to this new Gmail folder in Thunderbird.Enter a name and from 'Create as a subfolder of', choose your Gmail Account.Right-click on your Gmail Inbox or any folder and choose 'New Subfolder'.After successful sign in, create a new folder in your configured Gmail account in Thunderbird app.Step 3: Copy Thunderbird Mail Items to Gmail Account Folder If this still does not work, follow the next method. Once you are done with these changes, try to sign in to Thunderbird using Gmail credentials. Also, visit and follow the setup wizard.Click on the Allow less secure appstoggle switch to turn ON the option.Then click 'Turn Off' to disable 2-Step Authentication.

Sign in and then click '2-Step Authentication'.Disable 2-Step Authentication in your Google account.In case the Gmail login fails and you see a sign-in error in Thunderbird, follow these steps, Troubleshoot Thunderbird Gmail Sign-In Issue If you experience sign-in errors, follow the troubleshooting guide below on Gmail sign-in error. Click the IMAP radio button and then click on the ' Done' button.Enter your Gmail username and password.Click 'Email' under 'Set up an account'.Open your Thunderbird app and click on your Thunderbird email account.Step 2: Sign in to Thunderbird using Gmail IMAP Account Click on 'Forwarding and POP/IMAP'and then click the'Enable IMAP' radio button under'IMAP Access' section.Sign in to your Gmail account and open 'Settings'.But first, you need to enable IMAP access in your Gmail account. You can use your Gmail account to sign in to Thunderbird and move mail items from Thunderbird to Outlook. Method 1: Move Thunderbird Mail Items to Outlook via Gmail IMAP Step 1: Enable IMAP Access in Gmail There are three possible methods to migrate or move email and attachments from Mozilla Thunderbird email client to Microsoft Outlook. Methods to Migrate Thunderbird to MS Outlook

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