When users connect to Exchange with a client, such as 
Outlook 2003, they expect to communicate with other people 
in the organization easily. Users need to do more than 
compose e-mail messages with their messaging client. 
Whether they want to send an e-mail message, telephone a 
coworker, look up an office number, or schedule a meeting, 
they need to find information about another recipient 
quickly. Address lists help you to organize this type of 
information in a meaningful way.

The most familiar address list is the global address list 
(GAL). By default, the GAL contains all recipients in an 
Exchange organization