Steps to Configure your Zoho Account as POP in Thunderbird

1. Enable POP in the ZOHO Mail interface.
2. Launch Thunderbird application in your system.
3. Navigate to Tools and select Account Settings.
4. At the bottom of the left pane, click Account Actions and select Add new account.
   
5. Enter your name, your Zoho email address, and your Zoho email address's password.
6. Once done, click Configure manually...
7. Select the Protocol as POP3.
8. Once done, provide the POP3 and SMTP server details.
   
9. You may require an Application Specific password to set up the account on other devices if Two Factor Authentication is enabled for your account.
10. In the Server Hostname, provide pop.zoho.com for Incoming and smtp.zoho.com for Outgoing.
11. Select the port numbers to be '995' and '465' respectively. 
12. Make sure that the Authentication type is 'Normal Password' for both servers. 
13. Provide the complete email address as your username. 
14. Click Done to save the changes. Clicking Test might give an error message and reset the settings you configured.