iTunes may be used to synchronize contacts from other services including Windows Live and Microsoft Outlook.
Connect the iPhone to a computer using the supplied USB cable.
Note: Contacts may only be synchronized with one service at a time.
Open the iTunes application on the computer, then click iPhone.
Note: If the sidebar is displayed, click the iPhone name under DEVICES.
Click the Info tab.
Ensure Sync Contacts is checked.
Click the drop down list and select the preferred service.
Note: If prompted, enter the User ID and Password for the desired account, then click OK.
The prompts may vary depending on the synchronization option selected.
Click Apply to begin synchronizing contacts to the iPhone.
The iTunes contact synchronization settings are now changed.