Question: what is the difference between pop3 imap microsoft exchange activesync?
Answer: Between POP3 and IMAP, it's personal preference. ... IMAP interacts with the original copy on GMail's servers. For example, if you move a POP3 message to a “Old Mail” folder, it'll only move the message on your phone. If you do it on an IMAP connection, it will move it to the same folder/label on GMail itself.