Outlook RPC over HTTP and Outlook Anywhere configurations

Hi All,

EV 10.0.3/Exchange 2010

I go through the setting up exchange server archiving guide and found the following data

“With Outlook 2003 and later, users can access mailboxes using remote procedure call (RPC) over HTTP. With this protocol, MAPI is used to tunnel Outlook RPC requests inside an HTTP session. Using RPC over HTTP remote Outlook users can connect to Exchange Server mailboxes without the requirement for OWA or a virtual private network (VPN) connection.”

So my question is,

If you are not using Search and Archive Explorer externally via Outlook Anywhere then we don't need extra DNS? Just configure the Desktop policy to use the webmail address?