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Upload list to Marketo with existing members - Duplicate or Update?

Question asked by Hadar Ron on Oct 29, 2019
Latest reply on Oct 29, 2019 by Sanford Whiteman



When I'm uploading a CSV list into Marketo and in the list I have a few members that already exist in the system (Marketo/SF), Marketo create a new member or update the existing member (can be lead or contact)?


In addition to that, how Marketo define new members? By email address/First Name or something else?

And how can I edit it? 



Thanks in advance!