Your question does not contain enough details to resolve your issue.
Have you performed the following tutorials?
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NServiceBus Quick Start[
^]
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Introduction to NServiceBus[
^]
These tutorials help you get going.
What transport are you using? If you are using the learning transport then make sure all your projects are part of the same solution. If not, it might be that the folder where the messages are written is different because you are using different solutions.
You can configure the storage folder explicitly:
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Learning Transport - Storage Directory[
^]
Please, only use this transport for testing purposes.
Let me know if that works!
Particular Software also has its own forum at
https://discuss.particular.net/[
^] this forum is free to use and has much more people subscribed that are using NServiceBus and is or any of the other products part of the Particular Platform.