Establishing a Remote LAN Connection

To work remotely, you need to establish a remote connection to the server. How you accomplish this depends on the connection options available on your LAN and how the network administrator configured the LAN. The following are the most common methods for establishing a remote LAN connection:

  • Dial up access directly to the LAN. In this scenario, the LAN includes a Remote Access Services (RAS) server that enables clients to dial directly to the network using a modem or other device (such as an Integrated Services Digital Network [ISDN] connection). The RAS server can be the computer running Exchange Server or another server on the network, depending on the size of the organization and the load on the Exchange Server. Depending on the configuration of the RAS server, dial-up clients might have access to the network or only to the computer running Exchange Server.

  • Connect through a virtual private network connection over the Internet. If your LAN is connected to the Internet and includes a virtual private network (VPN) server, one of the options for retrieving e-mail messages is to create a VPN connection to the LAN and then connect to the computer running Exchange Server. A VPN server enables clients to establish secure connections to the network through a public network such as the Internet.

  • Use a demand-dial connection between two networks. If you have two or more offices, those offices might connect using a demand-dial connection. The connection might take place over a standard dial-up line, or use ISDN or another communication method. The demand-dial interface enables the two routers that connect the offices to establish the connection when a client requests it, such as when you connect to synchronize your Outlook 2007 data.

  • Use HTTP to connect to the server. Outlook 2007 includes support for HTTP as a communications protocol when used with Exchange Server 2003 or Exchange Server 2007, enabling you to connect to your Exchange Server remotely (such as from the Internet) without using a VPN connection.

Note

You can connect to an Exchange Server through the Internet without configuring Outlook 2007 to use RPC over HTTP. However, doing so requires that you open several ports on the firewall that, for security reasons, really should not be opened. For that reason, this method is neither recommended nor explained in this chapter.

Because this book focuses specifically on Outlook 2007 and its integration with Exchange Server, the details of how to set up a RAS or a VPN server aren’t covered.

Using HTTP to Connect

Using HTTP as the communications protocol for your Exchange Server is a useful remote access method that eliminates the need for you to run VPN software on your client computer. It also eliminates the need for the network administrator to support those VPN connections. Most networks already have port 80 open for HTTP and port 443 open for secure HTTP (HTTPS) through Secure Sockets Layer (SSL), so providing HTTP-based access to Exchange Server requires only some setup on the computer running Exchange Server and configuring Outlook 2003 to use HTTP.

Note

HTTP-based access to Exchange Server requires Exchange Server 2003 or later and Outlook 2003 or later.

Chapter 41, explains how to configure the Exchange Server client for Outlook 2007, including setting up the account to use HTTP and configuring the server, so that information isn’t repeated here. Beyond those steps, there is really nothing else to do to start using HTTP to access your mailbox. However, here is some advice:

  • Use Cached Exchange Mode and synchronize from the LAN at least once. To reduce the load on the server and the amount of bandwidth you will use connecting to the server, consider using Cached Exchange Mode, which creates a locally cached copy of your mailbox on your computer. Before connecting remotely, connect to the server on your LAN and allow Outlook 2007 to synchronize the cache with your mailbox. By synchronizing from the LAN rather than a remote connection, you will likely decrease the amount of time required to complete the synchronization, particularly if your mailbox contains a large amount of data.

  • Use RPC and TCP/IP when connected locally to the network. The default settings for using HTTP in Outlook 2007 to connect to your Exchange Server cause Outlook 2007 to attempt a connection with RPC over TCP/IP for a fast connection before it attempts to use HTTP. Leave this setting at its default to provide better performance when you connect to the server from your LAN. Change this setting only if your Exchange Server requires an HTTP connection to the server.

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