Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2
Topic Last Modified: 2011-12-01
An address list is a collection of recipient and other Active Directory objects. Each address list can contain one or more types of objects (for example, users, contacts, groups, public folders, conferencing, and other resources). You can use address lists to organize recipients and resources, making it easier to find the recipients and resources you want. Address lists are updated dynamically. Therefore, when new recipients are added to your organization, they're automatically added to the appropriate address lists.
As shown in the following figure, client applications, such as Microsoft Outlook, display the available address lists that Exchange provides.
Address lists reside in Active Directory. Therefore, mobile users who are disconnected from the network are also disconnected from these server-side address lists. However, you can create offline address books (OABs) for users who are disconnected from the network. These OABs can be downloaded to a user's hard disk. Frequently, to conserve resources, OABs are subsets of the information in the actual address lists that reside on your servers. For more information, see Understanding Offline Address Books.
Looking for management tasks related to managing Mailbox servers? See Managing Mailbox Servers.
Changes to Address Lists in Exchange 2010 SP2
Global address list (GAL) segmentation (also known as GAL segregation) is the process whereby you segment users into specific groups to provide customized views of your organization’s GAL. In Exchange Server 2007 and earlier, segmenting the GAL was complicated, requiring you to use either a Query Base DN (which acted as a root for directory searches) or access control lists (ACLs) to allow or deny access to each address list.
To simplify the process, Exchange 2010 Service Pack 2 (SP2) introduces address book policies (ABPs). When creating an ABP, you assign a GAL, an offline address book (OAB), a room list, and one or more address lists to the policy. You can then assign the ABP to mailbox users, providing them with access to a customized GAL in Outlook and Outlook Web App. The goal is to provide a simpler mechanism to accomplish GAL segmentation for on-premises organizations that require multiple GALs.
To learn more about ABPs, see Understanding Address Book Policies.
Default Address Lists
When users want to use their client application to find recipient information, they can select from available address lists. Several address lists, such as the global address list (GAL), are created by default. Exchange contains the following default address lists, which are then automatically populated with new users, contacts, groups, or rooms as they're added to your organization:
- All Contacts This address list contains
all mail-enabled contacts in your organization. Mail-enabled
contacts are those recipients who have an external e-mail address.
If you want mail-enabled contact information to be available to all
users in your organization, you must include the contact in the
GAL. To learn more about mail contacts, see Understanding
- All Groups This address list contains
all mail-enabled groups in your organization. Mail-enabled groups
are groups of recipients that are created to expedite the mass
sending of e-mail messages and other information. When an e-mail
message is sent to a mail-enabled group, all members of that list
receive a copy of the message. To learn more about mail-enabled
groups, see Understanding
- All Rooms This address list contains
all resources that have been designated as a room in your
organization. Rooms are resources in your organization that can be
scheduled by sending a meeting request from a client application.
The user account that's associated with a room is disabled. For
instructions about how to add resource mailboxes to an address
list, see Add
Resource Mailboxes to an Address List. To learn more about
resource mailboxes, see Understanding
- All Users This address list contains
all mail-enabled users in your organization. A mail-enabled user
represents a user outside your Exchange organization. Each
mail-enabled user has an external e-mail address. All messages sent
to mail-enabled users are routed to this external e-mail address. A
mail-enabled user is similar to a mail contact, except that a
mail-enabled user has Active Directory logon credentials and can
access resources. To learn more about mail-enabled users, see
- Default Global Address List This
address list contains all mail-enabled users, contacts, groups, or
rooms in the organization. During setup, Exchange creates various
default address lists. The most familiar address list is the GAL.
By default, the GAL contains all recipients in an Exchange
organization. In other words, any mailbox-enabled or mail-enabled
object in an Active Directory forest that has Exchange installed is
listed in the GAL. For ease of use, the GAL is organized by name,
not by e-mail address. For more information, see Managing Address
- Public Folders This address list
contains all public folders in your organization. Access
permissions determine who can view and use the folders. Public
folders are stored on computers running Exchange. For more
information about public folders, see Managing Public
Custom Address Lists
An Exchange organization can contain thousands of recipients. If you compile all your recipients in the default address lists, those lists could become quite large. To prevent this, you can create custom address lists to help users in your organization find what they are looking for more easily.
For example, consider a company that has two large divisions and one Exchange organization. One division, named Fourth Coffee, imports and sells coffee beans. The other division, Contoso, Ltd, underwrites insurance policies. For most day-to-day activities, the employees at Fourth Coffee don't communicate with the employees at Contoso, Ltd. Therefore, to make it easier for employees to find recipients who exist only in their division, you can create two new custom address lists—one for Fourth Coffee and one for Contoso, Ltd. When searching for recipients in their division, these custom address lists allow employees to select only the address list that's specific to their division. However, if an employee is unsure about the division in which the recipient exists, the employee can search within the GAL, which contains all recipients in both divisions.
You can also create subcategories of address lists called hierarchical address lists. For example, you can create an address list that contains all recipients in Manchester and another that contains all recipients in Stuttgart.
Best Practices for Creating Address Lists
Although address lists are useful tools for users, poorly planned address lists can cause frustration. To make sure that your address lists are practical for users, consider the following best practices:
- Avoid creating so many address lists that users won't be sure
which list to search for recipients.
- Name your address lists in such a way that, when users glance
at them, they will know immediately which recipient types are
contained in the list. If you have difficulty naming your address
lists, create fewer lists and remind users that they can find
anyone in your organization by using the GAL.
For detailed instructions about creating an address list, see Create an Address List.