Exchange 2007 different environment types

LCR (local continuous replication)
this was mainly used for small business who wanted to replicate a copy of their Exchange database to another disk on the same server.

lcr

SCC (Single copy cluster)
was what I would call a traditional Exchange cluster which used shared storage to host the Exchange database.

scc

CCR (cluster continuous replication)
was used to replicate Exchange database information between 2 Exchange server allowing for hardware and storage redundancy but was limited to 1 Active node and 1 Passive node.

ccr

SCR (standby continuous replication)
was introduced in Exchange 2007 SP1 to provide the ability to replicate Exchange databases to an disaster recovery location.

scr

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