Address lists are special groupings of email accounts that allow users to quickly find specific email users that are part of some logical grouping in the GAL. The RUS is responsible for creating and maintaining the address list links to the mail-enabled objects. The RUS links an address list to mail-enabled objects by adding the address list’s distinguished name to the object’s showInAddressBook multivalue attribute. Once an address list has been created, it can take hours or days for the RUS to fully populate the list by stamping all related objects’ showInAddressBook attributes, depending on the size of your organization.

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Exchange Server 2003 has introduced a new type of distribution list: the query-based DL. These are, as implied by name, distribution lists that are built on the fly based on a query; specifically an LDAP query against Active Directory.

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Anyone who has used a distribution list knows how useful they can be. It is much easier to send email to a single email address than to tens or hundreds or even thousands of addresses. Exchange allows you to mail-enable any group object in Active Directory. Then, when someone sends email to that group, every mail-enabled or mailbox-enabled user in the group will receive a copy of the email.

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Using a graphical user interface

1. Open the ADUC snap-in.
2. This needs to be run on a workstation or server that has the Exchange Management Tools loaded
3. If you need to change domains, right-click on Active Directory Users and Computers in the left pane, select Connect to Domain, enter the domain name, and click OK
4. In the left pane, browse to the parent container of the user, right-click on the user, and select Exchange Tasks.
5. On the Welcome screen, click Next.
6. Select Remove Exchange Attributes and click Next.
7. Read the warning and click Next.
8. On the Completion screen, click Finish.

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A mail-enabled contact is a contact that has at least one email address defined within Exchange. A contact cannot have a mailbox because it is not a security principal, so there is no way to safely authenticate the object. You use a mail-enabled contact when you have an email address external to the forest’s Exchange organization that you want to be listed in your GAL. The email address could be external to the company or it could just be external to that forest’s Exchange organization. Examples would be people from other companies or users who do not use the Active Directory of the Exchange organization.

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