The first milestone in cloud computing history was marked by the arrival of Salesforce.com in 1999, which is the pioneer of the concept of delivering enterprise applications via a simple website. . The next development was Amazon Web Services in 2002, started providing a suite of cloud-based services including storage, computation and even human intelligence through the Amazon Mechanical Turk.In 2009, as Web 2.0 hit its stride, Google and others started to offer browser-based enterprise applications, though services such as Google Apps. According to Dan Germain, chief technology officer of Cobweb Solutions, “The most important contribution to cloud computing has been the emergence of "killer apps" from leading technology giants such as Microsoft and Google. When these companies deliver services in a way that is reliable and easy to consume, the knock-on effect to the industry as a whole is a wider general acceptance of online services.” To know more about the history of cloud, go to: http://www.computerweekly.com/feature/A-history-of-cloud-computing