What is the total cost of ownership, TCO, of the cloud? When we think of the cloud, we think of using applications in the cloud such as Salesforce, Box.net, and others. We may even consider using security as a service tool such as Zscaler and others. In some cases we also think of placing our own workloads in the cloud using Amazon and other tools. The real question that comes to mind is the TCO of the cloud? Not now, but long term.