I have a problem on syncing contacts and leads from the CRM back to Marketo. We use MS Dynamics Online 2015. We did some cleansing in the Marketo database on duplicates. After that the contacts and leads in the CRM wont match the ones in Marketo. Support says that after cleansing the leads in Marketo - CRM can't find leads (microsoft type) in Marketo and therefore will not sync. It's strange because from the beginning when integrating CRM to Marketo a sync was made and all of the contacts in the CRM were synced over. Does anyone have simular problems?