What's the difference between IMAP and POP3?

Episode 1283 (10:49)

Mike from Portland, MN

Mike uses Thunderbird with POP3 and wonders if he should use IMAP. He doesn't know anything about it, though. Leo says that Thunderbird is the best email client out there and Leo uses IMAP with it. POP (post office protocol) will download his email and then remove it from the servers. IMAP, by contrast, will allow him to see the email and keep copies of it on the server. This is beneficial because people use more than one computer and mobile phone.

Mike has learned that keeping the battery charged all the time helps him to get longer life out of the battery, and he's discovered that the $99 iPhone battery case is worth the cost just for that.