Well, its been a long time in the making and I for one have been waiting for a long time for this data to be published publically.  I was fortunate enough to be taught by Bill Thompson at the ECoE during my Masters rotation and he went through some of the data in this paper.  It dramatically altered the way I approached HUB/CAS scaling work…

If you are currently designing Exchange 2007 or planning to, I highly recommend you read through this paper.

http://technet.microsoft.com/en-us/library/dd901772.aspx

Posted by Neil Johnson, MCS UK, MCM Exchange 2007