If you are setting up your email software (e.g., Outlook, Apple Mail, Thunderbird, etc.), you must indicate how you want to receive email — either with a POP connection or an IMAP connection. IMAP is the preferred method — each device you use syncs directly with the email server so that you see the same content on all your devices. For the vast majority of people, POP is not preferred or required.
Note: If you need help setting up a POP connection, please contact customer support.