Outlook Anywhere

Outlook Anywhere feature, formerly known as RPC over HTTP, lets clients that use Microsoft Office Outlook 2010, Outlook 2007, or Outlook 2003 connect to their Exchange servers from outside the corporate network or over the Internet using the RPC over HTTP Windows networking component

Outlook Anywhere and Exchange 2010 Windows RPC over HTTP Proxy component, which Outlook Anywhere clients use to connect, wraps remote procedure calls (RPCs) with an HTTP layer. This allows traffic to traverse network firewalls without requiring RPC ports to be opened. In Exchange 2010, as in Exchange 2007, it's easy to deploy and manage this feature. To deploy Outlook Anywhere in your Exchange 2010 messaging environment, you need to enable Outlook Anywhere on at least one Client Access server

Note: - Outlook Anywhere should be enabled only on Client Access servers that are exposed to the Internet. Do not enable Outlook Anywhere on internal Client Access servers

Coexistence For mailboxes on Exchange 2010 Mailbox servers, clients must connect through Exchange 2010 Client Access servers. Outlook Anywhere can be used in environments where Microsoft Exchange Server 2007 and Exchange Server 2003 servers are still being used. If you have users with mailboxes on Exchange 2003 servers, and these users are using Outlook 2007 or Outlook 2003 to connect, you must configure these clients manually