Re: solcited" (messages with a syncronous orchestration waiting for a response) and "unsolcited" messages (messages without a waiting orchestration that i need to send to a different orchestration for processing).

There is a waiting orchestration means the orchestration has subscribed message. It is BizTalk engin’s job to the deliver the message to the right destination. If the message can’t be delivered and message is still there, it would be suspended.

Could you let us know how you are sending message between orchestration? (Bindings etc?)