http://blogs.technet.com/jmayans/archive/2006/11/14/exchange-2007-server-roles-misconceptions-number-of-servers.aspxI recently came across a posting from someone attending ITForum in Barcelona mentioning that Exchange 2007 has many server roles... "how many servers do we need!"? This article explains server roles in Exchange 2007 in more depth. A "server role" is justen-USCommunityServer 2.1 SP1 (Build: 61025.2)