This IDC study provides a top-down sizing of the cloud system software market in 2015 and a 2016–2020 forecast for this market. Historical and forecast revenue data is shown for the total worldwide market. Cloud system software is a competitive market within IDC's software taxonomy and a subset of the virtual machine and cloud system software (VMCSS) functional market.
According to Gary Chen, research manager, IDC's Software-Defined Compute, "Cloud system software is the foundational compute element that underpins private IaaS clouds. While cloud technology is much desired by enterprises, it is still very complex to deploy and operate. The CSS market is growing respectably and steadily, but CSS is also increasingly competing with public cloud options."