Updated: May 6, 2015
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Here is a wizard which guides you through the steps to configure OWA for Enterprise Vault. This wizard includes five steps that will help you install packages, configure external access, and verify functionality. A sixth step will provide an opportunity to learn more about OWA.
This is a definite bookmark if you are looking to configure, or re-deploy, OWA within your environment. It is interactive and points you to relevant information to allow you to get OWA right first time.
Just tried it for a site i am working with now having issues - EV10 with Exchange 2003
So answered 1st Question as being 2003 only and it just says:
"Installation of the Enterprise Vault OWA 2003 extensions is not covered by this interactive tool. For instructions, please refer to Chapter 9 of the Setting Up Exchange Server Archiving document included on your EV installation media."