Give this a try ..

Assuming the email list is in col A, A2 down

Enter a label in B1

Put in B2: =IF(COUNTIF($A$2:A2,A2)1,"X","")
Copy B2 down

This will mark all duplicates in col A with "x"

Do an autofilter in B1, select "X"

--
Rgds
Max
xl 97
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GMT+8, 1° 22' N 103° 45' E
xdemechanik <atyahoo<dotcom
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"Ed P" wrote in message
...
I have a list of e-mail addresses. I want to find all the duplicates. I
have
sorted the list but the list is extremly long.
I have not found an effective method for doing this. I want the result
to
show me where those duplicates occur.
Can anyone help me?
Thank you
Ed