IMAP vs POP3 Protocol
All major email clients allow mailboxes to be accessed using one of two protocols; either via:
POP3 remains popular but with the increasing use of the mobile web, users are increasingly finding that IMAP better meets their needs on the move.
What's the difference?
IMAP email access coordinates between the server and your mail application.
Backing Up Email
Whichever protocol you choose to use, we cannot overstate the importance of periodically backing up email.
This is especially important if you run a business.