You can move a messaging engine from
one server to another by changing the policy which is bound to the messaging engine's HAGroup. This is the recommended
way of moving the messaging engine.
You should not attempt to directly activate or deactivate the members of the HAGroup that relates to the messaging engine.
You must stop the messaging engine before
changing the policy. Once the messaging engine has
moved, you will need to restart it manually.
You might want to move a messaging engine if you aware of a problem
which will cause the server on which the
messaging engine is
currently running to fail. For more information, see
Routing high availability group work items to a different application
server.