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New documentation is located at http://masstransit-project.com/MassTransit.
The latest version of this page can be found here.
MassTransit is a free, open source, lightweight message bus for creating distributed applications using the .NET framework. MassTransit provides an extensive set of features on top existing message transports, resulting in a developer friendly way to asynchronously connect services using message-based conversation patterns. Message-based communication is a reliable and scalable way to implement a service oriented architecture.