Yes, you can replace JBOSS MQ with any proprietory Messaging system.
You can find in Soniq MQ and WebSphere MQ integrations on search or Sourceforge.net
As far as I understand you need to have a rar which connects to your MQ (if confirming to JCA spec) and need to have a jms-ds.xml as is the case with the jboss's own MQ and you need to have your JNDIAdapter extend org.jboss.jms.jndi.JNDIProviderAdapter
any other clues or suggestions???
ActiveMQ has this on their WIKI.
Last time I looked at ActiveMQ it was very new. Most of the work had been
done since August this year.
So I would recommend you test it thoroughly before using it in production.