Hello,

I have a quick question.. I heard before that there can be two exchange servers running live on a network, one acting as a Backup (sort of like how a PDC and BDC works on a NT network or teaming with NICs) where if the primrary exchange server fails the backup server will kick in. both servers will be updated on the fly.

Has anyone implemented this before or knows about it?

Please advise. B)

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