Final answer:
To add a second mailbox in Outlook, go to the File tab, click on Account Settings, select Account Settings again, and then follow the prompts to set up the new mailbox.
Step-by-step explanation:
To add a second mailbox in Outlook, follow these steps:
Open Outlook and go to the File tab. Click on Account Settings and select Account Settings again. In the Account Settings window, select the Email tab and click on New. Enter the email address and password for the second mailbox and click on Next.
Outlook will attempt to automatically set up the account. If it fails, you might need to manually configure the server settings. Contact your email provider for the correct settings. Once the account is set up, click on Finish to complete the process.