Exchange ActiveSync Overview
Exchange ActiveSync allows cell phone users to access and work with e-mail, calendar, contacts and tasks without an Internet connection.
SMTP protocol – What it is
“Simple Mail Transfer Protocol – (from “simple mail transfer protocol”) is a network protocol that is designed to transfer mail.”
Basic information about the differences between POP3 and IMAP4 protocols
By default, POP3 clients delete downloaded messages from the mail server. This makes it difficult to access e-mail on multiple computers, since downloaded messages are stored on the local computer.