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Sometimes, your Contacts app might not work the way you expect. If you don't see all your contacts, review the steps in the Chapter 3: “Sync Your iPad with iTunes” or Chapter 4: “Other Sync Methods” to learn how to sync with your Address Book application. Make sure you have selected All Groups in the settings in iTunes.
TIP: If you are syncing with another contact application, such as Contacts in Gmail, make sure you select the option closest to All Contacts, rather than a subset like a particular group.
This next section is for Microsoft Exchange users. Sometimes you may encounter a problem where your GAL contacts don't show up. If this happens, begin by making sure you are connected to a Wi-Fi or 3G cellular data network.