Address book in Apple Mail

Achmelvich Said:

"Address book in Apple Mail: How do I recover my address book in Apple Mail that crashes on startup? Contacts only contains some of the addresses."

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Use Another Device:

If you have another device associated to the same Apple Account, then enable Contacts on its iCloud Settings. If this iMac was synced with Contacts in its own iCloud settings, then enabling Contacts on the other device, should reveal it all.

Go Here: Set Up and Use iCloud Contacts - Apple Support