Howtoforge posted a guide about running a small business server with ClearOS 6.3.0

This guide shows how you can install and run a Small Business Server with ClearOS 6.3.0 (Community Edition). With ClearOS, you can run various services (such as a file- and print server, a web proxy and content filter, a mail server, etc.) in your local network and manage them through an easy web interface. ClearOS provides apps for each of these tasks from its marketplace - many of them are free, some of them have to be paid for. ClearOS Community is open-source and free. There's also a professional version available for which you have to pay, but which in return provides better support, better tested apps and updates, etc.

  Running A Small Business Server With ClearOS 6.3.0 (Community Edition)