The indexing service on the mailbox server where passive copies reside will build the index based on the active database copy (not the locally passive copy). The indexing service talks to the active database over the MAPI network, not the dedicated replication network. So expect to see CI data over the MAPI network, especially if the passive copy is in a remote site, there will be big amount of CI data transfer over the WAN link which should be taken into consideration during the designing and p
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