Web 2.0 companies have been fully taking advantage of Hadoop based open source tools to tackle Big Data needs. Microsoft now offers the best of both worlds with its own Hadoop solution on Windows Azure with full compatibility and additional rich toolsets. This session is a "getting-started" tutorial on developing Big Data applications on Windows Azure. We cover application scenarios, Hadoop on Azure, tools, and applied data analytics. More importantly, we show you how to put everything together with a couple of sample applications.