Google Apps Directory Sync Administration Guide - Manual (Page 111)

Configuration 111
Below are some of the most common reasons to import Shared Contacts:
• Add groups and outside addresses to autocomplete. User addresses in your
domain will show up in autocomplete. However, groups and outside
addresses are not visible in autocomplete. Create LDAP sync rules to import
any groups or outside addresses you want your users to see when using
autocomplete.
• Give pilot users access to all users for autocomplete. If you are adding a small
number of users for a pilot program, consider adding other users as Shared
Contacts, so that pilot users will see the address of other users in
autocomplete.
• Provide supplemental directory information to users. If your users want to see
rich contact information from your directory server for their contacts (such as
postal addresses, phone numbers, companies, and titles), synchronize this
information using Shared Contacts. Users will see this additional information
in the Contacts page after they have added the contact manually, or sent mail
to that contact’s address.
Important: Shared Contacts do not show immediately. After you synchronize
Shared Contacts, it may take up to 24 hours for the changes to appear in Google
Apps.
Shared Contact Attributes
Specify what attributes Google Apps Directory Sync will use when generating the
LDAP shared contacts.