By definition Software as a Service is easier to roll out than on-premises software because you don’t have to install it on your own servers, let alone desktops or mobile devices. This favors a best-of-breed approach rather than picking monolithic suites from the same vendor. That alone is a big market shift from the steamrolling that Microsoft was able to inflict in the 90s on the desktop with Office, and to a lesser extent on servers with what was then known as BackOffice. Over the past decades, IBM became DEC, Microsoft became IBM, Google became Microsoft, and a thousand SaaS players are now blooming – though none of them has quite become the next Google yet. Facebook and Apple, consumer companies at heart, are shunning this market for the most part.