The Grouper Messaging system interface will have a RabbitMQ implementation.
Install RabbitMQ
On windows, install erlang, then install RabbitMQ
Get the management ui working (do this as an administrator)
C:\Program Files\RabbitMQ Server\rabbitmq_server-3.6.10\sbin>rabbitmq-plugins.bat enable rabbitmq_management
Restart RabbitMQ service as an administrator (e.g. in windows in local services console)
Login to http://localhost:15672/ with guest/guest
Default port is 5672