This document discusses four case studies of organizations moving mission critical applications to the cloud using Cloudify. The first case study is of an investment bank moving thousands of applications to their private cloud. The second is of a telecommunications company using Cloudify to build a carrier-grade PaaS offering on their cloud platform. The third case study is of a systems integrator using Cloudify to automate deployment of an IBM big data stack for customers on OpenStack. The fourth case study is of a company using Cloudify for multi-cloud disaster recovery across regions.