A public folder can be configured to have
During replication, changes made to items in a replica are sent to all other replicas of the public folder throughout the organization. Changes made to the folder, the folder's properties, or the public folder hierarchy are replicated to all servers. When you no longer want a public folder replica, you can delete it from its database.
When more than one replica of a public folder exists, connections users make are distributed across all replicas in an organization. If there is a replica of the folder on the user's public folder server, the first connection attempted is to that replica. If a connection to the replica cannot be made because a server is unavailable or because a network connection cannot be made, a connection to a different server in the organization is attempted. If routing group connectors enable public folder referrals, connections to other servers are attempted.
Related TopicsControl Public Folder Replication