In this tutorial we are going to provide you with step-by-step instructions on how to install Citadel on a CentOS 7 VPS. Citadel is an open source messaging and collaboration platform. Citadel has lot of useful features, such as managing emails, calendars, scheduling, instant messaging and other collaboration tools.
This install guide assumes that a web server is already installed and configured on your virtual server, so make sure to use a different port for the WebCit front end. At the time of writing this tutorial, the latest stable version of Citadel is 9.01.