Enterprise Vault Proxy Server and Outlook Anywhere

Hi,

I'm trying to understand more about this Outlook Anywhere (rpc over http) method of connecting to EV and I wanted to know if an EV Proxy server was a requirement or not.

I understand that an EV Server can act as this Proxy server and was wondering if I can convert an existing EV Server to act as a Proxy too or do I install a new Proxy EV server?