Transfer data from one field to another
We were previously populating a Marketo only field and now we need to move that data to a custom SFDC field. I need to export the data from Marketo and re-import into the new field, but we have many duplicates in our database. Anybody have any ideas of how to re-import and make sure we're tying the data to the correct lead records, seeing as email address is the unique identifier?