Some of my contacts are in both the GAL and my local Contacts folder. This is a feature of the Social Connector, with the automatic updates of contacts enabled by default.
Outlook updated my contacts (in my contacts folder) with information from the Global Address Book. A change log is added to notes so you know what was changed.
To change the setting in Outlook 2010, go to the View ribbon, People Pane, Account Settings, Settings button and change the update option from Update without prompting to Prompt before update or Never update.
In Outlook 2003 or 2007, the Account Settings dialog is accessed from Tools, Social Networking Account settings.
Outlook Social Connector in the Group Policy editor.The Global Address Book (GAL) is a directory of available contact information for CUMC, NYPH and Columbia University faculty, staff and students.