I have lost all of my contacts.
All of my contacts have disappeared from my iMac. Still have them on my iPhone. How can I get them back?
OBS iMac (20-inch Early 2008), OS X El Capitan (10.11.6)
Are you syncing contacts using iCloud? Are the contacts at iCloud.com/Contacts? More information would help.
If syncing with iCloud, go to iCloud.com using a computer and select Settings. When that page loads, look at the bottom left side under Advanced and see if you can restore from there.
How to Recover Files, Contacts, Calendars and Reminders in iCloud