I have an existing Exchange 2007 Server with all roles in one machine. Pretty small environment. Its running on Server 2003 SP2 and not very stable. Id like to add another Exchange 2007 Server running 2008R2 into the same domain, migrate the content to the new server, and decommission the old server. Is there any reason why I cant install the new server into the existing environment with all the roles.? Mabe I dont understand the roles enough, but Im just trying to make sure that 2 servers each holding all the roles wont fight with one another...etc.