Customers choosing IaaS usually have existing project constraints, which are not adaptive to PaaS. We can think about a complex installation of an enterprise-level software suite, like an ERP or a SharePoint farm. This is one of the cases where a service like an Azure website probably cannot fit.

As mentioned in the previous chapter, PaaS is probably the future of Cloud computing and we should expect investments in PaaS to overcome the existing limits which lead clients to an IaaS product. This said, IaaS is a set of services/products where the customer deals with middle level management. For VMs, for example, this means that everything is happening on the operating system.

To remind you of which things you need to manage in different scenarios, take a look at this image:

An image showing what customers manage (inside the thick boxes) in different scenarios.

This image shows that with an On-Premise infrastructure, we need to directly manage everything,...