We are using IBM MQ at present. We have a plan to migrate our tm2.3 to tm2.6. From tm2.6 Baan only supports IBM MQ. Infact MQ only work with JMS from tm2.6 onwards. I am not completly sucessfull yet. But I keep you posted the progress if you want or be in touch with me.
So far we are able to get the test xml messages form MQ into Baan. I can say little sucess. At present I am simulating my laptop as webserver (loaded adopter, connector, MQ client in laptop). Next week we have plan to do the same in our test webserver. You can contact me via my e-mail if you need any urgent help..."firstname.lastname@example.org". Baan suppot is doing huge help in our upgrade.