MJ Petroni September 12, 2014 full spectrum innovation, concepts, case study Software as a Service (SaaS) and Platform as a Service (PaaS) MJ Petroni September 12, 2014 full spectrum innovation, concepts, case study Software used to be sold as any other product: a box on a shelf (or a download equivalent) and either basic post-purchase support or paid support contracts. Users would have to wait for a new release to get new features.