What's the difference between POP and IMAP?

POP	IMAP
Post Office Protocol	Internet Messaging Access Protocol
Best if you use only one computer to check email	Best if you use many different computers to check your email
Downloads your email to the particular computer you are checking it on	Your mail is always on the server
Allows you to keep a large backlog of email messages only limited by the size of your computer.	You are limited by your mailbox size quota for how many messages you keep, although you can archive old messages and save them onto your computer manually.
Does not have a web interface (Some webmail companies, such as Yahoo, will let you check POP mail)	Has a web interface. If you are using NCF Webmail, you are using IMAP.
New messages are downloaded in their entirety, you have to wait for the message to download.	New message headers are downloaded so you see all your mail faster, the message you want to read is not downloaded to your computer until you click on it.