Enterprise Vault™ Deploying the Office Mail App externally through TMG
Load balancing considerations
The flexibility of Enterprise Vault architecture means that any user in the site (internally or externally) can access the Enterprise Vault Office Mail App using any Enterprise Vault server. For this reason, publishing only one Enterprise Vault server through TMG is feasible. However, load balancing is possible and can be implemented in the following ways:
Configure a TMG server farm that contains all the Enterprise Vault servers in the site. TMG will distribute the load when forwarding requests for the Office Mail App. When used in combination with the first method above (published_server on the internal network), load balancing will be achieved for both internal and external access.
Use an external load-balancer or round-robin DNS on the specified host name that is configured in the TMG rule.