Download and install

1. Download Mozilla Thunderbird based on your operating system.
2. Open the downloaded file, Thunderbird Setup 148.0.exe (Windows) or Thunderbird 148.0.dmg (Mac).

For Windows users

1. Click Run and then Yes in the pop-ups that appear to allow the program to begin the installation.
2. Proceed with following the steps in the Mozilla Thunderbird Setup Wizard (default settings should work fine).

For Mac users

1. Drag the Thunderbird icon into the Applications folder.
2. Open the Applications folder, double-click the Thunderbird icon, and click Open.

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Log in to existing email account

1. Make sure that IMAP is enabled for your personal email account.
   • Windows: If you do not see the menu bar press the alt key to view the menu bar.
     
   • Mac: The menu bar should automatically appear. Open Thunderbird.
2. From the menu, navigate to File - > New -> Existing Mail Account.
3. Enter your name and email address, then click Continue.
   
4. Two configuration options will show. Select the IMAP option.
    
5. Click Done.
6. You will be prompted to sign in with your Google Account. Enter your email. Click Next. 
   
   
7. Log in with your password.
8. Click Allow to give Mozilla Thunderbird email access to your Google account.
9. Click Finish to start using Thunderbird.
10. Visit Import a MBOX File into Gmail with Thunderbird for importing a mbox file.

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Read without logging in to email account

1. Move the *.mbox file to a folder on your computer.
2. From the Account Setup tab, enter a name and email address. Leave the password blank, then click Configure manually.
   
3. Do not make any changes to the configuration. Click Advanced config.
   
4. Click Ok to confirm the Advanced configuration.
   
5. Close the Account Settings tab. Open the Inbox tab.
   
6. Click once to set the focus on Local Folders.
   
7. Visit Import a MBOX File into Gmail with Thunderbird for importing a mbox file.

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