Our sync employs a field level conflict resolution mechanism. For a particular record, if field X is updated in Microsoft Dynamics CRM and field Y is updated in Marketo, then we will update Marketo with the new value for field X and Microsoft Dynamics CRM with the new value for field Y. In the case where the same field is updated on both systems for a particular record with a short period of time, we will choose the Marketo value as the winner for Leads and the Microsoft Dynamics CRM value as the winner for Contacts.
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