I was just in Atlas thinking that maybe there were some reports that could be run to show all customers on payroll. There is one report - Customer Segmentation Report which looks like it fits the bill. Holy cow. Running the thing is damn near impossible. I am able to select the product type (Sage 100 ERP) but selecting the module is almost impossible. Part of the products are in understandable coding (primarily product name) - the others are part numbers or some unrecognizable part ID.
Searching through the records is nearly impossible because you run into the issue of needing to add more records to the lookup so that you get a complete view. I gave up after adding 25,000 and not finding a Sage 100 Payroll option.