MAPI stands for Messaging Application Programming Interface. POP3 stands for Post Office Protocol Third and IMAP4 stands for Internet Messaging Access Protocol. IMAP4 keeps the messages on a server. One needs...

IMAP is an Internet standard protocol for reading emails. It was originally developed in 1986 at Stanford University as a competitor to widely popular POP. IMAP4 is a version of IMAP. This version is defined...