The key difference between the POP3 and IMAP is that using POP3 protocol the user has to download the mail before accessing it whereas, using IMAP protocol user can partially check the content of mail prior downloading it. Using IMAP protocol user can organize emails on the server which can not be done using POP3.What does POP3 and IMAP mean?
IMAP is short for Internet Message Access Protocol . With IMAP, the message does not remain on the local device, such as a computer, it remains on the server. POP3 is short for Post Office Protocol. With POP3 mail, it will connect and attempt to keep the mail located on the local device (computer or mobile).