MAPI vs IMAP4

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Taking my 70-284 Exchange exam soon. One area that is still confusing
me is what MAPI really is and how it compares to imap4/pop3 etc....
If anyone could set me straight it would be appreciated:

Questions:

1) Mapi is a protocol.. just like IMAP4/POP3 but with more
features.... right?
2) How does MAPI compare to IMAP4? Both can use the default folder
tree?
3) What ports does mapi use? Is there a form of "secure" mapi like
with imap pop3 and http?


A brief explaination would be very appreciated... Thanks guys

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