Microsoft ISA Server 2006 can be used to secure OWA access to Exchange Server 2007 or 2010 by using Web publishing rules to make the Exchange OWA Web site available on the Internet.

As OWA clients connect directly to Enterprise Vault for Archive Explorer and archive search client requests, you need to configure your ISA Server to ensure that clients can access Enterprise Vault. In addition to publishing the OWA Web site, you also need to publish to clients the Enterprise Vault Web server URL.

Figure: Access to Enterprise Vault using ISA Server 2006 shows how ISA Server 2006 can provide access to Enterprise Vault.

Figure: Access to Enterprise Vault using ISA Server 2006

See the following technical note for detailed instructions on how to configure ISA Server 2006 for access to Enterprise Vault from OWA clients:

http://www.symantec.com/docs/TECH61472

See About ISA Server with Enterprise Vault

See About configuring ISA Server 2006 for Outlook Anywhere client access to Enterprise Vault

See About configuring ISA Server 2006 for OWA 2003 and Outlook 2003 using RPC over HTTP