To set up a POP3 email account in Microsoft Outlook 2007, follow these steps:
1. Select Tools > Account Settings and click New on the Email tab.
2. Manually configure the server settings and select POP3 as the account type.
3. Enter your name, email address, incoming and outgoing server names, username, and password.
4. Make selections for encryption, ports, and whether to leave messages on the server.
5. Click OK, Next, and Finish to complete the setup.