I have a three server Exchange 2007 environment. All three are running on Server 2003 R2 boxes. I see in the services that Microsoft Exchange Replication Service is running. My question is, how can I tell if this environment is running lcr, ccr, scr etc? We are looking to remove one box and I just want to figure out the replication portion first. Thanks.

http://technet.microsoft.com/en-us/library/bb124721(EXCHG.80).aspx Both CCR and SCC are solutions that are deployed in a Windows Server failover cluster. Only the Mailbox server role can be installed in a failover cluster. No other roles can be installed in a failover cluster. A Mailbox server that is deployed in a failover cluster is referred to as a clustered mailbox server. Clustered mailbox servers running in a CCR environment are very different from clustered mailbox servers running in an SCC environment. Furthermore, clustered mailbox servers in Exchange 2007 RTM and Exchange 2007 SP1 are very different from clustered mailbox servers in previous versions of Microsoft Exchange. You can use Get-MailboxServer <CMSName> | fl Name, ClusteredStorageType in the Exchange Management Shell to determine if a clustered mailbox server is hosted in a CCR environment or in an SCC. A value of NonShared indicates that the clustered mailbox server is in a CCR environment, and a value of Shared indicates that the clustered mailbox server is in an SCC. A value of Disabled indicates that the Mailbox server is a stand-alone server. You can also check Active Directory to determine if a clustered mailbox server is hosted in a CCR environment or in an SCC by examining the value for the msExchClusterStorageType attribute of the Mailbox server object. A value of 1 for the msExchClusterStorageType attribute indicates that the clustered mailbox server is hosted in a CCR environment, and a value of 2 indicates that the clustered mailbox server is in an SCC. A value of <Not Set> indicates that the Mailbox server is a stand-alone server.