Required software and restrictions on clustering Enterprise Vault with Microsoft server clusters

You must install Windows Server 2003/2008 Enterprise Edition or Datacenter Edition on each primary and failover node. Each node must be running the same operating system.

Note the following restrictions:

If you have an existing Enterprise Vault 7.0 or later installation then, subject to certain restrictions, you can use the Enterprise Vault Convert to Cluster wizard to convert the Enterprise Vault servers to servers with cluster support. The conversion requires you to move the Enterprise Vault data manually to highly available locations.

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Converting an existing Enterprise Vault installation to a Microsoft server cluster