We did not have any percentage show for unsubscribes from a year-long analysis of sent emails. I contacted Marketo support about this issue, but was told that Email Insights stores only 4 months' worth of data. I am still waiting on clarification from the support rep, but has anyone else been told something similar? I am not sure whether this pertains to the unsubscribe percentage or to all email insight data? This is very confusing as the calendar time-frame goes beyond the 1 year mark.