OPC DA Server/Client API

We require our existing application developed in Visual C++ (VS2008) to become OPC Complaint (OPC DA & OPC AE) Server and Client by using your APIs provided to connect with any OPC DA/AE Server and Client. Since we have an immediate requirement, it would be great if the implementation takes less time and simple. The OPC to be compatible with latest OPC version 3.0 as well as earlier versions like 2.0. Please provide your suggestions.