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    They are two completely different things. What makes you think they are similar? Commented Oct 8, 2019 at 6:42
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    A "message queue" generically is just a list of data designed to induce behaviour in a different part of a system (maybe synchronously or not), where the elements in the list are processed in FIFO order, and typically by a part of the system that is not closely coupled to the parts which add the elements into the queue. Reactive Extensions is a set of tools designed for manipulating the temporal aspects of data flows in a system - whereas a lot of data manipulation involves specifying what processing occurs, Rx is designed to alter when processing occurs. Commented Oct 8, 2019 at 9:10