JBoss has just spent the past few weeks working closely with IBM, Microsoft and other members of the OASIS WS-TX technical committee to validate the interoperability goals of the WS-AtomicTransaction specification. I'm pleased to say that, as with the first interoperability workshop, the committee has achieved its goals and demonstrated interoperability between a number of heterogeneous implementations. Next steps will be to make the specification a standard and to move on the interoperability of WS-BusinessActivity.
If you want to see how we (and others) got on with interoperability, you can check the interoperability matrix. Unfortunately the table treats the participants anonymously and randomly: P1 now may be a different participant to P1 in a minutes time.