Internet Messaging Access Protocol 4
In POP3, once a message has been downloaded from the server, it is, by default, deleted from the server unless the user proactively configures his e-mail client to act otherwise. This deletion is a real disadvantage for users who move from workstation to workstation because e-mail they have already downloaded remains on the workstation to which they downloaded it. IMAP4 was developed to allow users to leave their e-mail on the server and to allow remote access to messages. Thus, IMAP4 extends the functionality of POP3 to allow both offline and online storage of messages.
In addition, IMAP4 allows user-initiated storage of messages and nonmail messages, permits users to manage their own configurations, and allows ...
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