This is a first publication of its kind elaborating service based architectural design for automation of mergers and acquisitions developed in line with strategy and enterprise architecture. First chapter starts with Strategy and Foundation of Enterprise-Architecture. Business Strategy defines the business services to achieve desired profit, growth and competitive advantage under all circumstances at minimal cost. Based on Business Strategy, IT Strategy evolves, which leads to IT Foundation composed of IT Capability Model and IT Operating Model. Enterprise Architecture incorporates SOA, TOGAF, COBIT, ITIL and our proprietary frameworks to design each phase of M&A architecture in order to achieve service based strategic enterprise architecture for M&A. Second chapter presents development of Business Architecture (BA) in line with strategy, which elaborates the M&A business illustrated with Frameworks, Business Motivation Model, Organizational Structure, Value-added Chain, Key Performance Indicators, Key Risk Indicators, Strategy and Tactics, Business Scenarios, Business Process Model, Business Services, Use Cases, Capability Models and Business Services. Capability based planning approach supported with alignment framework applies SOA to transform business functionalities into business capabilities and business services. The business architecture is built with the vision of enterprise architecture wherein consolidated business services are directly mapped into IT services for business-aligned, agile and effective IT solution. Business architecture of M&A includes the domain functionalities like organization structure, motivational & strategic requirements, due-diligence, classification & combination, legal services, financing, accounting, taxes, negotiation & deal structure, risk & performance management, takeover, bid strategy, defensive techniques, commissioning & post-merger integration, synergy realization. Information System, Data and Application Architectures are elaborated. Information system consolidates the core functional and data services of M&A, which acts as development and execution environment for enterprise wide applications. The business driven IT supported with framework achieves business-aligned IT where business services and capabilities are transformed into IT services. Application architecture includes the design of M&A functionalities using use cases and class diagrams. Platform and Technology Architecture presents distributed computing, service platform, workflow automation, enterprise integration, service bus, data management, security & availability, events based object/message oriented middleware etc. The focus of the book is to present the strategy and enterprise architecture, business architecture, information system, application & data architecture, platform & technology architecture of M&A function of an imaginary investment bank elaborated and illustrated in project development manner. Investment Banking aspirants & professionals for M&A function will benefit a great lot regarding business and IT services of M&A in line with strategic enterprise architecture.