Microsoft Dynamics C5 is an enterprise resource planning (ERP) software product from Microsoft.The product is part of the Microsoft Dynamics family, and intended to assist with finance, manufacturing, supply chains, analytics and electronic commerce for small and medium-sized enterprises. Value-added resellers (VAR)s as well as customers can have full access to the business logic source code, and it has a reputation as being easy to customize.More than 70,000 licenses have been sold since 1995.