Turning off permissions:
1. CNTRL-click or right click on the folder that you want to stop sharing.
2. Select Folder Properties.
3. In the Permissions tab, do one of the following:
• To stop sharing, click the name of the user with whom you want to stop sharing the Address Book, Calendar, or Mail folder, and then click Remove.
• To temporarily suspend access, on the Permission Level pop-up menu, click None.
Note: If you change the permission level to None, the user remains on the list, which allows you to quickly reinstate permissions later.