I was just flicking through the pages towards the end of my Workflow Foundation book which I have barely read (I figured maybe they hide all the juicy stuff at the back ) and noticed something that caught my eye - it said that workflow services, ie workflows hosted in WCF services, cannot use WCF duplex contracts.
This sounds pretty strange to me as I cant understand why that would be the case but can anyone confirm if this is true or if there is any way around it etc as I would like to use both workflow and duplex contracts (they are one of the best parts of WCF!) ?

Cheers
Chris