Exchange Server 2007 : Configure the Client Access Server - Enable and Configure Outlook Anywhere

2/6/2011 9:52:32 AM
Problem : In Exchange 2003, there was a feature called RPC over HTTP. Now that has been reinvented as Outlook Anywhere. What do you need to do to enable it on your CAS server? And how do you configure your users to use Outlook Anywhere from their home systems?

Solution :
To begin with, you have to remember that SSL is an important aspect of Outlook Anywhere, so ensure that you have a valid SSL certificate from a trusted CA in place.

There are two steps to the process of enabling Outlook Anywhere. The first is to install the RPC over HTTP Windows Networking Component. The second is to enable Outlook Anywhere on the CAS server.

Depending on the version of Windows Server (2003 or 2008), there are different steps to enable RPC over HTTP. Let’s look at both, then look into enabling Outlook Anywhere and finally, we consider the client side to the configuration process.

Install RPC over HTTP on Windows Server 2003

To install RPC over HTTP on Windows Server 2003, perform the following:

Select Start, Control Panel, and enter Add or Remove Programs.

Select Add/Remove Windows Components.

Select Networking Services and click Details.

From the Networking Services page, under Subcomponents of Networking Services, click the checkbox for RPC over HTTP Proxy. Then click OK, click Next, and finally, click Finish.

Install RPC over HTTP on Windows Server 2008

To install RPC over HTTP on Windows Server 2008, perform the following:

Select Start, Administrative Tools, Server Manager.

In the Navigation pane, select Features. You will be able to see the features currently installed.

Select the Add Features link.

From the Add Features Wizard, locate the RPC over HTTP Proxy and select the checkbox.

You might be notified that your selection is part of role services that must be installed for your Web Server (IIS). If this is the case, select the button Add Required Role Services. Then click Next.

You are shown a Web Server (IIS) introduction page. Click Next.

Role Services will be shown. Click Next.

You are shown the feature you are installing and the role services under the Confirmation screen. Click Install.

After the Results screen shows the installation is successful, click the Close button.

Enable Outlook Anywhere

To enable Outlook Anywhere on your CAS server, perform the following steps:

Open the EMC.

From the Navigation Tree, expand the Server Configuration work center and select Client Access.

From the Actions pane, select Enable Outlook Anywhere to open the wizard, shown in Figure 1.

Figure 1. The Enable Outlook Anywhere Wizard.

Type in the external host name, which is what users will type into their Outlook client; it has to match the SSL certificate name.

Next you have to select a Client authentication method of either Basic or NTLM. Basic sends credentials in clear text. NTLM encrypts the credentials before sending them. NTLM also notes whether you are using a domain system and uses those credentials, so you will not have to continually put in the credentials (which is what you have to do if you choose Basic).

The checkbox Allow Secure Channel (SSL) Offloading is necessary only if you plan to use a separate server, such as an ISA 2006 server, to handle the SSL encryption and decryption.

After you configure your options, select Next.

When complete, select Finish.


It might take a while for the Outlook Anywhere services to become available for your clients to connect to. Some have reported waits of up to 15 minutes.

Configure Clients to Use Outlook Anywhere

With the process of enabling Outlook Anywhere, all users with mailboxes can now use the connection unless you change that within their settings.

Only Outlook 2003 and Outlook 2007 clients can perform Outlook Anywhere connections. The concept is the same, although the steps can be different. We are going to walk through the steps for Outlook 2007.

To begin, you want to create a new profile. You can do this in Windows Vista by performing the following steps:

Select Start, Control Panel, Mail.

From the General tab, click Add.

Provide a name for the profile (perhaps OutlookAnywhere).

You are taken to the Auto Account Setup. Click the checkbox at the bottom that says Manually Configure Server Settings or Additional Server Types. Then click Next.

From the Choose Email Service tab, click Microsoft Exchange, and then click Next.

From the Microsoft Exchange Settings tab, you can input your Exchange server name (FQDN or NetBIOS) and the username. You can check the name with the Check Name button. Click More Settings.

Select the Connection tab.

At the bottom, notice the heading Outlook Anywhere. Select the checkbox Connect to Microsoft Exchange Using HTTP, and then select Exchange Proxy Settings.

Note from the Exchange Proxy Settings dialog (shown in Figure 2) that you can configure the URL for the connection to the proxy server for Exchange. You want to configure the use of SSL and the proxy servers that have the principal name in their certificate. You have two checkboxes regarding how to connect in a fast and slow network situation (using HTTP first and then TCP/IP). Finally, you can select your authentication settings to use Basic or NTLM, which depends on how you configured your Outlook Anywhere settings earlier.

Figure 2. Configuring Exchange proxy settings.

Complete making configuration adjustments, and click Next.

When you see the Congratulations screen, click Finish.

From within the Mail settings, you can choose to prompt for a profile to be used when you open Outlook. Or, you can choose Always Use This Profile and select the one you want.


To confirm the connection status, hold the Ctrl key down and right-click the Outlook icon in your system tray. Select Connection Status. You should be able to see HTTPS connections that are established and going through the CAS server we’ve configured it to use for Mail.

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