Post Office Protocol version 3 (POP3) allows Outlook to retrieve your e-mail from the server. When using POP3, Outlook can only access your server inbox and cannot read any other public or private folders. POP3 is not intended to provide full manipulation of e-mail on the server. Although messages can be flagged and left on the server, e-mail is usually only downloaded and then deleted from the server. POP3 itself does not handle sending e-mail; this functionality is handled by the SMTP protocol.
Internet Mail Access Protocol (IMAP) allows a client to access messages in private and public folders on a server. Outlook users can access e-mail in their Microsoft Exchange Server mailbox or ISP server, if supported, without downloading entire items, including any attachments. Outlook can retrieve specific messages or portions of a message, such as an attachment. IMAP does not send e-mail; this functionality is handled by Simple Mail Transfer Protocol (SMTP).
Simple Mail Transfer Protocol (SMTP) is the Internet standard for transporting and delivering electronic messages. SMTP has become the defacto standard for sending e-mail over the Internet.
Hypertext Transfer Protocol (HTTP) has been in use on the Web since 1990 and is commonly associated with Web pages. Some ISPs and Internet e-mail services, such as Hotmail, provide access to your e-mail account to retrieve and send messages from anywhere that you have access to a Web browser. Outlook support for MSN and Hotmail HTTP accounts provides many of the benefits of an IMAP e-mail account, including downloading headers only and e-mail management on the server.
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