Evers, Joris. Q&A: Microsoft's Thompson talks about Exchange plans. Computerworld. May 26, 2004.

Microsoft's David Thompson (VP Exchange) discusses future versions of Exchange. Some quotes: "We would expect a release of Exchange around the time of the next release of Office." ... also mentions three roles in future Exchange as "edge, front-end and storage" .... also "the edge services will use SQL technology as part of some of the message-queuing support"