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Microsoft® Exchange Server 2010 Inside Out by Tony Redmond

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POP3 and IMAP4 clients

POP3 and IMAP4 are Internet email protocols that are supported by a wide variety of clients and servers. Fans of these protocols love the lightweight nature of their connections, which is one of the reasons they are the protocols of choice for most consumer free email services such as Hotmail and Gmail (Hotmail supports POP3; Gmail supports both protocols). POP3 is the older and less functional protocol. IMAP4 is more functional than POP3, but less functional than MAPI. Nevertheless, modern IMAP4 clients, including Outlook, can build a rich range of features around the rudimentary but superefficient communications to download messages from a server. Of course, unlike MAPI, POP3 and IMAP4 are both protocols that clients use ...

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