These are a couple of our retention reports. As with most of our reports, these reports are available for CSV export.

Inactive reports, located under the Customer Reports, list customers that do not currently have any active series. By default, the report shows customers who have purchased a series in the past, but you can also look at just customers who have only ever been comped a series.

Unused accounts, located under the Customer Reports, report lists customers that have never purchased or been comped/given a series.