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Are there any changes in MQ v9 that applications should be aware of that would affect business processes?
IBM documents the changes in each release. Here is the page you need for IBM MQ V9:-
What's new and changed in IBM MQ Version 9.0 Version IBM MQ 9.0.x
I'm not sure what sort of changes would affect business processes though. Have you suffered such a change in a prior release that could enlighten us further to the type of change you are looking out for?