Accessing the EV from Externally

Are you running Exchange 2013? If you are you can deploy the Office Mail App. If you're running Exchange 2010 then you would have to configure standard OWA fuctionality

These are both covered in Chapters 9 and 10 of Setting Up Exchange Server Archiving - http://www.veritas.com/docs/000004155

You need to be able to hit http://domain.com/EnterpriseVault/ externally. Your firewall documentation should provide some information. And see https://www.veritas.com/support/en_US/article.HOWTO59068

Once it's published see https://www.veritas.com/support/en_US/article.TECH63250

Publish your EV server using whatever firewall you have in place, either TMG, UAG, or F5 etc. then publish your Outlook Anywhere and OWA and bind it with your EV server publishing so that Search or/and Archive Explorer can be accessed externally. The technotes above will guid you through these stuff.

One thing that I would say is when you setup the certificate to publish the EV server don't turn SSL on on the EV server in the Enterprise Vault virtual directory as this will stop EV server working especially with the current EV shortcuts and then you have to setup EV to use SSL etc. thsi will cause complications more thatn it should do. All you need to do is Bind SSL in IIS to the Enterprise Vault virtual directory and this will split interal users to use HTTP and exterrnal users to use HTTPS. This way no further configuration is required on the EV server other than splitting HTTP for internal users and HTTPS for external users.