Thats because NServiceBus is a Service Bus and not a broker: http://www.udidahan.com/2011/03/24/bus-and-broker-pubsub-differences/ http://www.udidahan.com/2011/

Thats because NServiceBus is a Service Bus and not a broker: http://www.udidahan.com/2011/03/24/bus-and-broker-pubsub-differences/ http://www.udidahan.com/2011/03/24/bus-and-broker-pubsub-dif... For HA you simply run a distributor process for each logical event on windows cluster and add as many worker nodes as you see fit. Because NServiceBus uses the store and forward pattern if a NServiceBus process/machine hosting it goes down, you are still guaranteed the eventual delivery of messages when the process/machine is resumed.