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Deleting in SFDC and Re-Uploading in Marketo

Question asked by 61618 on Jul 29, 2014
Latest reply on Jul 29, 2014 by 51412
I want to back into some deduping by deleting a list of 13k or so leads in SFDC (we have our sync up and running fully, so should quickly be marked as deleted within Marketo) and then uploading them via Marketo to ensure that any leads that are duplicates are deduped.

I did this earlier, and I'm pretty sure it didn't work; there's not many dupes showing, but almost all of them came back as non-dupe leads. My sales director is convinced this is wrong, so I'm turning to the community - if a lead is deleted in Salesforce, I've waited for the API sync to go, and then re-uploaded that lead via a list upload, would it revive the deleted dupe lead or would it properly dedupe into another existing variant of the lead?

Complicated question, I suppose, and I'm kinda confused.