MSN Hotmail's incoming mail server name, or POP3, is pop-mail.outlook.com. This address is used to access Hotmail from another mail service or software other than through the MSN website on a browser. Since Outlook.com has replaced Hotmail, Outlook's POP3 address is also used to pull mail from Hotmail email addresses.
Some examples of external mail services include Apple Mail, Unibox and Airmail. While some services automatically detect a mail service's POP3 address, others require this address to be entered manually in order to receive incoming mail. When the software asks which protocols it should use to communicate with the mail's server this information must be entered. Similarly, the outgoing mail server address, or SMTP, is smtp-mail.outlook.com.