We are having a duplication issue where both leads and contacts are being created in Salesforce and Marketo. Here is a little background:
Leads that are created in Marketo are automatically synced to Salesforce if their source is not salesforce.com. When they reach 100 points, they are converted into contacts. However, if they make a purchase either on our website or over the phone, a new contact is created in Salesforce (without checking to see if a lead exists first). The contact syncs back to Marketo and we are left with duplicate contacts: 1 lead and 1 contact. How do we prevent this from happening? Is it possible to do so on the Marketo end?