Apple mail address book location

The location of the Address Book in Apple Mail on a Mac depends on the version of macOS you're using:

macOS High Sierra (10.13) and later:

• The Address Book is now part of the Contacts app, which is located in the Applications/Utilities folder or can be found in the Dock if you have it there.
• You can also access Contacts from the Apple menu by clicking on "Contacts" or by searching for it in Spotlight.

macOS Sierra (10.12) and earlier:

• The Address Book is located in the Applications/Utilities folder or can be found in the Dock if you have it there.
• You can also access Address Book from the Apple menu by clicking on "Address Book" or by searching for it in Spotlight.

iOS devices (iPhone, iPad, iPod touch):

• The Contacts app is pre-installed on iOS devices and can be found on the Home screen.
• You can also access Contacts from the Phone app by tapping on the "Contacts" tab.

Note that the Address Book/Contacts app is used to manage your contacts, including their names, email addresses, phone numbers, and other contact information.