Getting started with Messages Server couldn’t really be easier. Messages Server in the OS X Server 5 version of the Server app uses the open source jabber project as their back-end code base. The jabber binary is located at /Applications/Server.app/Contents/ServerRoot/private/var/jabberd directory and the autobuddy binary is at /Applications/Server.app/Contents/ServerRoot/usr/bin/jabber_autobuddy. The actual jabberd binary is also stored at /Applications/Server.app/Contents/ServerRoot/usr/libexec/jabberd, where there are a couple of perl scripts used to migrate the service between various versions as well. Setting up the Messages service is simple. Open the Server app and click on Messages in the Server app sidebar.  Click on the Edit… button for the Permissions. Here, define which users and interfaces are allowed…