We've worked in the cloud since it made it's appearance in the IT world, so 'what is Hybrid in the first place' is a question we've had to answer many times. To answer at face value of the 'what is hybrid' questions, the term hybrid in IT usually refers to an integrated cloud service using both private and public clouds to perform distinct functions within the same organization. However, because this is a very open ended question and answer, we've decided to first speak on hybrid from an email perspective. Below, we go beyond your 'what is hybrid' question and discuss your email migration options, explain coexistence, discuss associated costs, and hybrid email migration service requirements.