The wide deployment of wireless networks and mobile technologies and significant increase of the number of mobile device users have created a very strong demand on various wireless-based mobile-based software application systems and enabling technologies. This provides many new business opportunities and challenges to service providers, mobile technology vendors, content providers and solution integrators. To meet the increasing demand on various reliable wireless-based software application systems, business people are looking for innovative ideas to create diverse mobile-commerce applications and service systems, and engineers are looking for cost-effective methods and efficient solutions to build high-quality software and application systems. The major theme of this workshop is engineering high-quality mobile-based application systems to support mobile users anywhere at anytime. It provides a forum to bring together researchers, scientists, software architects, and industry professionals to exchange innovative ideas and solutions in constructing wireless-based systems and applications. The topics for submissions include but are not limited to the following fields: Mobile system requirements engineering and design models, patterns, and methods 􀂃 Mobile system infrastructures, architecture styles, and service architectures 􀂃 Mobile system data retrieval methods, transaction models, cashing, and migration 􀂃 Mobile system validation and performance evaluation methods and tools 􀂃 Design and testing for system mobility, interoperability, scalability and reliability 􀂃 Mobile client design for user personalization, customization, and interoperation 􀂃 Ubiquitous and pervasive computing systems 􀂃 Location and context-aware for m-commerce services 􀂃 Mobile service platforms for m-commerce (mobile web enterprise) 􀂃 Middleware, mobile components, and agent technologies supporting M-commerce 􀂃 Wireless security problems, solutions, and mobile client privacy 􀂃 Mobile payment solutions, systems and platforms 􀂃 New wireless multimedia technologies, solutions and service platforms for mobile commerce and applications 􀂃 Innovative mobile technologies and applications, i.e. RIFD, mobile 2D-Bar Coding 􀂃 Wireless advertising models, solutions, service frameworks and systems 􀂃 Mobile payment protocols, solutions, service systems and platforms 􀂃 Mobile entertainment applications, services and platforms 􀂃 Middleware and mobile agent technologies for mobile applications and services 􀂃 Case-studies and experience reporting Authors are invited to submit original papers by following the instructions given by the web site http://compsac.cs.iastate.edu/EMOBS07/. Manuscripts will be limited to 8 pages following IEEE conference proceedings style and guidelines. All submissions will be peer-reviewed by the members of the international program committee. Accepted papers will be published in the workshop proceedings (EI Index) of the 31th IEEE Computer Software and Applications Conference (COMPASC2007). At least one of the authors of each accepted paper must register as a full participant of the workshop to have the paper published in the proceedings. The selected best papers will be published in the Journal of Theoretical and Applied Electronic Commerce Research.