OWA: Enterprise Vault Extensions in an active/active Microsoft cluster

Although Enterprise Vault OWA 2000 or OWA 2003 Extensions are supported in active/active clustered Exchange Virtual Server configurations, such configurations are not recommended by Microsoft and should be avoided, wherever possible.

In an active/active configuration, it does not matter which node you install the Enterprise Vault OWA Extensions on first.

Running the Enterprise Vault OWA configuration wizard on the first active node will perform the following tasks:

Register the Enterprise Vault OWA forms against the mailbox and public stores in the Exchange Virtual Server.
Create in Active Directory the following Exchange Server virtual directories for the back-end Exchange Virtual Server:
- ```
EnterpriseVaultExchange
```
- ```
EnterpriseVaultPublic
```
Create the following IIS virtual directories on the active node computer:
- EntepriseVaultProxy (on OWA 2003 only)
- ```
EVOWA
```
Populate the Proxy bypass list on the active node computer from the file, Enterprise Vault\OWA\EVServers.txt.

If you examine the log file, Enterprise Vault\OWA\BackEnd200nSetup.wsf.log, after the configuration wizard has run, you will see the lines detailing the mailbox and public folder forms registration.

When you then run the Enterprise Vault OWA configuration wizard on the other active node, it performs the following tasks for the Virtual Exchange Server associated with that node:

Registers the Enterprise Vault OWA forms against the mailbox and public stores in the Exchange Virtual Server.
Create in Active Directory the following Exchange Server virtual directories for the back-end Exchange Virtual Server:
- ```
EnterpriseVaultExchange
```
- ```
EnterpriseVaultPublic
```
Create the following IIS virtual directories on the active node computer:
- EntepriseVaultProxy (on OWA 2003 only)
- ```
EVOWA
```
Populate the Proxy bypass list on the active node computer from the file, Enterprise Vault\OWA\EVServers.txt.

When you install and configure the OWA Extensions on the second active node in the cluster, warning messages in the log file will indicate that the EnterpriseVaultPublic and EnterpriseVaultExchange virtual directories already exist. As these virtual directories were created when you configured the OWA Extensions on the first node, you can ignore these warning messages.