Impresive! from Steve W Thomas:
For starter, why would you want to call a Receive Pipeline from within an Orchestration? I had to struggle for a bit to come up with a good reason I can find it useful in debatching Scenarios that require mapping prior to debatching or for debatching into smaller batches using a map. I could also find it useful when working with flat file.
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Super Cool: Supports receiving multiple messages returned from the pipeline and can use enumeration to process each message.
more on his blog