The Global Address List, sometimes referred to as "GAL," is a dynamic list containing all users on your domain. The Global Address List can be managed by your domain administrator in order to hide users that may not represent real people, such as email@example.com.
Contact information for the Global Address List is pulled from individual profiles of users. To update your listing, click the settings icon. Then expand the My Settings folder and clickAccount Profile in the navigation pane.
Note: If the Global Address List is enabled for your domain, all information you enter into your profile can be seen by all other members of your domain.
The Global Address List functions almost identically as My Contacts.