JBI JMS component and LW JMS component

Hello,

I discovered that there is two JMS BC (JBI and LW) and I'm not sure to understand the reasons of these two differents implementations from a JMS / JBI exchange point of view. Are these two implementations achieving the same goals ? Could you explain me the reasons of LW components ? Is that just a question of configuration and deployment ? Are the JBI components not enough ?

Thanks for all.