Private cloud vs public cloud, is always the fundamental question when an administrator has to decide how its company is going to spend money by acquiring different technologies. The best option is really to choose a solution which includes a private cloud server and private cloud software. A good portion of small, medium. And even some large corporations, choose public cloud providers, as their e mail providers. And this is wrong because, companies will lose their control of the information and the control of security. This is a popular topic and the discussion between public cloud vs private cloud is reaching high levels of popularity.