Can Someone Proofread My 'remove Duplicates' Script?

DELETE
FROM tblContacts
WHERE tblContacts.ID IN(
SELECT F.ID
FROM tblContacts AS F
WHERE Exists (
SELECT email, Count(ID)
FROM tblContacts
WHERE tblContacts.email = F.email
GROUP BY tblContacts.email
HAVING Count(tblContacts.ID) > 1
)
)
AND tblContacts.ID NOT IN(
SELECT Min(ID)
FROM tblContacts AS F
WHERE Exists (
SELECT email, Count(ID)
FROM tblContacts
WHERE tblContacts.email = F.email
GROUP BY tblContacts.email
HAVING Count(tblContacts.ID) > 1
)
GROUP BY email
)



I readily admit that I've shamelessly copied 'n pasted this from a tutorial and then taken a stab at tweaking it for my own ends. But I really don't understand what it's doing.

Really, all I want to know is that it will remove records with duplicate email fields. But I could also do with confirming - looking at the "SELECT Min(ID)" bit - does that mean that if it finds a duplicate, it'll delete the latest-added one? And if so, that changing it to remove the earliest-added one is simply a case of changing MIN to MAX?


Thanks :)