The Invoice Store - Version 4.0 A complete Invoicing, Customer Tracking, Estimating and POS software product for the small business. Perfect for any mailorder, service, retail business or any business requiring invoicing or sales. It maintains customers, sales personnel, vendors, inventory management, invoicing, packing slips, customer statements, sales, refunds, credits, returns, quotes, backorders, recurring invoicing, barcoding, reports and is network ready.