The Address Book is an address book application provided by Apple with Mac OS X. It is a central repository for contact information, integrated with other OS X software like Mail, iChat and .Mac.

Address Book contains these features as of Mac OS X 10.4.3:

• Full VCard 3.0 Support
• Smart groups (similar to iTunes)
• Integrated Spotlight searching
• iCal integration for birthdays
• Mail integration to email contacts
• iChat integration to populate a buddy list
• MapQuest address mapping
• Bluetooth integration for syncing addresses
• International address/phone number formatting
• Synchronize contacts with .Mac
• Synchronize contacts with a Microsoft Exchange server
• Address book sharing over .Mac
• LDAP directory server support (includes Mac OS X Server Open Directory support)
• SMS message support with a Bluetooth phone
• Cell phone auto-dialing support
• Large Type for phone numbers displays numbers on screen readable from across the room
• iSight support for taking contact pictures
• Add any image as a contact picture
• "Send Updates" feature allows you to email a group of contacts when your information changes
• Advanced printing features - print mailing labels, envelopes, contact lists, and a pocket address book directly from Address Book