I've been wondering- what exactly are the differences between these two?

POP (Post Office Protocol) is what most of us use. The e-mail program accesses the ISP's e-mail server and downloads messages to the computer. There they are read, replied to, stored in folders and generally managed.

IMAP (Internet Message Access Protocol) does much the same thing but messages are managed and stored up at the server. E-mail programs (i.e. Outlook Express) can be set up to access an IMAP account (and download messages if desired). IMAP accounts have a URL that must be known to set the e-mail program up.

However, I'm uncertain of the differences between IMAP and Webmail since they seem to do much the same thing. Both manage e-mail at server level and both can be accessed from anywhere. I think it is something to do with the IMAP protocol being more universally understood by various servers/systems ...and maybe IMAP is a bit more flexible in they way e-mail can be managed on the server. Not sure about those two points though. Someone who uses IMAP might be able to throw some light on that. Anyone?

I've been accessing my e-mail by IMAP lately, and it seems to be pretty much like WebMail, except the change of interface- I now have Mozilla, which I'm more comfortable with than the web-interface.