Compare and extract duplicates

Hi
I am comparing sheets of informaton and looking for email address duplication. Comparing sheet 1 to sheet 2 using MATCH and Using "NEW" or "DUPLICATED" as the results.What I would like to use is sheet 3 and extract the "DUPLICATED" data together with all the information in the same line of the duplicate data. In effect changing "DUPLICATED" to a line of information including the duplicate data.
Any help will be gratefully appreciated.
Cheers