Conditions for deploying a message set to a Version 2.1 broker

If you want to deploy a message set to a Version 2.1 broker that is participating in a Version 5.0 broker domain, the message set must satisfy the following conditions:
Related concepts
Coexistence with previous releases and other products
Message flow application deployment
Related tasks
Migrating a message set
Related reference
Custom Wire Format message set properties
Message set properties
TDS Format message set properties
XML Wire Format message set properties