Got a question regarding Lync Federation. Currently we have federation turned on so that its dynamic, so anyone can connect to us. However, another company we do business with (big company has not turned on dynamic) and we can not simply ask them to allow us for federation. I know the trick for live addresses not using the msn domains and it works (example: user.name(domain.com)@msn.com but how can i talk to those users using Lync if they dont federate me/cant federate me? Am i really out of luck and have to continue using MSN to talk to them?