http://msmvps.com/blogs/ehlo/archive/2009/06/05/1694192.aspxDetermining the Scalability of Combined Client Access and Hub Transport Server Roles in Exchange 2007 Back Pressure Changes in Exchange 2007 SP1 What is new with Exchange Server 2010 ActiveSync and Outlook Mobile? Exchange 2010 killer feature (for meenCommunityServer 2008.5 SP2 (Build: 40407.4157)