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Why Marketo imports existing leads?

Question asked by 45923 on Feb 20, 2014
Latest reply on Aug 7, 2015 by bea174b6b2f48d0d08b22e3a3f2a675102a89d76
Hi there,

I've imported a list to Marketo, and here's the report I got: 

I can see Marketo recognized a few leads as already existing. But why would it import them again? Wouldn't it de-duplicate those leads? 

Thank you,