To share an address book with another user:
Click the tab of the address book you want to share.
If the tab is not visible, the book is not open.
Click File > Sharing.
Click the Shared With radio button.
Type the name of the person with whom you want to share the address book > click Add User.
If you do not know the name of the person, click the Open Book icon.
Click each user's name in the Share List > assign him or her Access rights.
Click OK or Apply to save your changes.
When you click OK or Apply, the person with whom you want to share the address book receives a notification. The Status column displays as Pending until the user accepts or declines the shared address book request, then the column is updated to reflect the user's selection.