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Null value overwriting data value during list import

Question asked by Kathi Gosche on Sep 23, 2014
Latest reply on May 19, 2015 by 5f294047149fdda454defca094d661d04e985c71
I have a lead that had complete contact information in their profile. However, when I imported a list of webinar attendees from a partner company that included this lead, their phone number and address where changed to null. How is this possible? I was under the impression that list import only changed fields that are populated with different information and that empty fields do not owerwrite populated fields. Is this not true? 

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