Zero Purchase Customer List

How can we generate reports to find out that which customers has not purchased any item or product in current or specific month

Define a Sales Invoice Totals by Customer report for the desired time period. However, the report suppresses customers with no activity. So add a comparative column that goes back in time to a period when the customers did purchase. (The easiest thing is make the comparative column span from the beginning of your business until the day before the time period you are really interested in.)