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Hi,
Replication within Exchange can't be used for fault tolerance. Replication is used to deliver domain- or forest-wide information like adressbooks and public folders to every Exchange server within your organisation.
What you are looking for is the clustering of Windows Servers, on witch Exchange (or any other service) is installed as a virtual service. As soon as the pimary cluster-node has a problem, all services 'fail over' to the secondary cluster node.
See hxxp://www.microsoft.com/windowsserver2003/technologies/clustering/default.mspx for more information on clustering.
Hope this helps
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