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hxxp://experts.about.com said:POP3 (as per web-opedia): Short for Post Office Protocol, a protocol used to retrieve e-mail from a mail server. Most e-mail applications (sometimes called an e-mail client) use the POP protocol, although some can use the newer IMAP (Internet Message Access Protocol).
There are two versions of POP. The first, called POP2, became a standard in the mid-80's and requires SMTP to send messages. The newer version, POP3, can be used with or without SMTP.
(2) Short for point of presence, an access point to the Internet. ISPs have typically multiple POPs. A point of presence is a physical location, either part of the facilities of a telecommunications provider that the ISP rents or a separate location from the telecommunications provider, that houses servers, routers, ATM switches and digital/analog call aggregators.
IMAP (as per the same): Short for Internet Message Access Protocol, a protocol for retrieving e-mail messages. The latest version, IMAP4, is similar to POP3 but supports some additional features. For example, with IMAP4, you can search through your e-mail messages for keywords while the messages are still on mail server. You can then choose which messages to download to your machine.
IMAP was developed at
The big difference between the two is the fact that, with pop, you download everything from your email hosts servers to your system.. with IMAP, you can take a look at what is on the server first and then decide which you want to download and which you simply want to delete.
Web-based is different in that everything stays on the web-based hosts servers (Hotmail, Yahoo, etc).. Nothing ever gets downloaded to your system.