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To provide OWA access to Enterprise Vault for Exchange Server 2007 mailboxes, Enterprise Vault OWA Extensions need to be installed on all computers running Exchange Server 2007 with Client Access Service (CAS) role installed.
To provide OWA access to Enterprise Vault for Exchange 2000 or Exchange Server 2003 mailboxes, Enterprise Vault OWA Extensions need to be installed on all front-end and back-end OWA Exchange Servers.
When you install the Enterprise Vault OWA Extensions on your Exchange Servers, ensure that you install the same Enterprise Vault release version of the extensions on all the Exchange Servers. All the Exchange Servers on which you install the extensions should be at the same Exchange Server service pack and hotfix level.
As Enterprise Vault OWA 2003 Extensions modify OWA control files on Exchange Server 2003, the version of these files must be one that is supported by Enterprise Vault. The supported versions of OWA control files are listed in Exchange Server OWA control file versions in the Enterprise Vault Compatibility Charts. Before you install an Exchange Server hotfix that changes the OWA control file version, check in the Compatibility Charts that the version is supported by Enterprise Vault.
The Enterprise Vault Extensions for Exchange Server 2003 servers are also used to support RPC over HTTP connections to Exchange Server 2003. No Enterprise Vault extensions are required to support RPC over HTTP connections to Exchange Server 2007.
Note that the Enterprise Vault buttons are not available in OWA clients when using OWA 2000, which means that you can only view archived items with these extensions. To be able to archive, restore and delete archived items from your OWA client and have integrated access to Archive Explorer and Search features, you need to use OWA 2003 on Exchange Server 2003 or use OWA 2007.
Instructions of how to uninstall the Enterprise Vault OWA Extensions are given in the following technical note on the Symantec Enterprise Web site: