We have four physical servers which three of them are running as DCs and the other one is just member server acting as application server.
I have just checked what operation masters roles are assigned to each DC and I have just found out that one DC which runs Exchange Server 2007 has all operation master roles assigned: Schema master, Domain naming master,PDC,RID pool manager and Infrastructure master.
I am just concerned about the roles are not being separated from each other. Is it something that needs a role separation? and what would be ideal scenario?