Im using 2006 final and a jabber account at tuff.org.uk, set up the MSN transport with Psi on my Mac (except that the mass of authorisation requests then crashed Psi, so I had to (labouriously) accept them all with iChat) and it all works perfectly, status shows up, everything. There may be some minor problems with starting a conversation, but this could be due to my wireless network and Mercury (on my Mac) not being able to hold a stable MSN connection.

Maybe they improved Jabber support for 2006 final?