How many Global 2000 enterprise applications are on the public cloud right now? You’ll see estimates of 20 to 30 percent, but that overstates the reality.
When all outsourced hosting is taken into account—which includes SaaS, IaaS, and PaaS—many analysts estimate that 20 to 30 percent of workloads are currently on the cloud. But a better metric is to look at what enterprise applications have migrated to an IaaS or a PaaS platform, which is how most enterprises measure their presence in the cloud. Although SaaS is certainly an option for replacing on-premises applications, its usage tends to be for new, often off-the-shelf software, not existing software as in the case of IaaS and PaaS.