You are the administrator of a Windows Essential Business Server 2008 environment. You configure all users to use the Messaging Server for sending and receiving emails. You have configured Outlook Web Access (OWA) to enable users to access their mailboxes from the Internet. You want to prevent an internal user from accessing OWA. You open the user’s properties dialog box in Active Directory Users and Computers and click the Disable option for Outlook Web Access on the Exchange Features tab.

What should you do next?

A.
Restart the IIS Admin service.

B.
Restart the Microsoft Exchange Service Host service.

C.
Restart the Microsoft Exchange Information Store service.

D.
Restart the Microsoft Exchange POP3 service.

Explanation:
You should restart the IIS Admin service. OWA is a Web-based e-mail client in Exchange Server 2007 that enables users to access their mailboxes from the Internet. In addition to enabling OWA for users in the corporate network, you can also prevent specific internal users from accessing OWA. You should perform the following steps to prevent an internal user from accessing OWA:

1. Open the user’s properties dialog box by using Active Directory Users and Computers.
2. On the Exchange Features tab, click Outlook Web Access, and then click the Disable option.
3. Restart the IIS Admin service.

The IIS Admin service is responsible for managing the Internet Information Services (IIS) metabase and provides support for the World Wide Web Publishing Service (W3SVC) service, the POP3 service, and the IMAP4 service, which are required by the Client Access server.

You can also deny access to external clients to use OWA to prevent internal users from accessing OWA remotely. To achieve this, you can use a combination of a recipient policy and a special HTTP virtual server. You should create a recipient policy with a Simple Mail Transfer Protocol (SMTP) domain name and apply the policy to user accounts for which you want to enable access. You should then create a new HTTP virtual server on the front-end server that specifies the domain that is used in the recipient policy. This will prevent users whose e-mail addresses do not have the same SMTP domain as the HTTP virtual server from accessing OWA.

You should not restart the Microsoft Exchange Service Host service, the Microsoft Exchange Information Store service, or the Microsoft Exchange POP3 service. The Microsoft Exchange Service Host service configures the Remote Procedure Call (RPC) virtual directory in IIS and registry data for Outlook Anywhere. The Microsoft Exchange Information Store service is responsible for managing Exchange Information Store, which includes mailbox stores and public folder stores. The Microsoft Exchange POP3 service enables users to connect to Exchange server by using the Post Office Protocol version 3 (POP3) protocol.