Current preferred server. The archiving task uses the server shown here when archiving from mailboxes, when possible. A mailbox that is on a different server must be replicated to this preferred server in order for the archiving task to be able to archive using this server. If a mailbox is not replicated to this preferred server, the task archives from the server that hosts the mailbox.

Mark as preferred server in cluster. Select this to use the current server as the preferred server in the cluster.