Replacing MSMQ with RabbitMQ may look like a straightforward transport migration. In applications that rely on WCF, SQL Server, and distributed transactions, however, it can also change the application's consistency model. RabbitMQ does not participate in the same ambient TransactionScope as SQL Server, so guarantees that were previously provided by the infrastructure have to become explicit parts of the application architecture.

This article compares three implementations of the same business flow: transactional MSMQ, a naive RabbitMQ replacement, and RabbitMQ with a transactional outbox.…