Linux has created a disruptive shift in the computing ecosystem and is driving significant change both from a technology and a business perspective. Every major computing initiative is being impacted by this shift. Organizations in the process of adopting Linux infrastructure and applications will find it worthwhile to give Linux-based email infrastructure a careful look. The advantages of Linux are well recognized by IT organizations as evidenced by the fact that its the fastest growing server platform in the market today. This paper examines the case for choosing a Linux-based email infrastructure and offers criteria for evaluating solutions.