SOA and cloud computing are two close related subjects. Knowing
how to take advantage of these paradigms might place a company ahead of its
competitors, especially in a demanding market where a company has to adapt
quickly to changes. This paper shows a proof of concept application that
basead only on open source tools, highlights the benefits of SOA and cloud
computing to SMEs. To achieve that goal, we model a BPMN 2.0 business
process that calls cloud services (e.g., google app engine and twitter) during
its flow through the Mule ESB, message oriented middleware.