Lost Contacts

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Need some more information:

1. What exact Mac model do you have?

2. Have you ever done any disk cleanup/maintenance/repairs, from a software perspective?

3. Are you making backups to an external device? Did you make one before you upgraded?
 
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I'm using a Mac Air Book. No cleaning or disc repair. Yes I do back up to a external hard drive. Yes I backed up before and after.
 
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What exact MacBook Air model do you have? I have a mid 2013 13" MacBook Air, with a 251 gig internal SSD. OS 10.12.6 has not caused me any issues.

Also, how did you upgrade to OS 10.12.6? Did you upgrade "in place"?

And, it would be beneficial if you do disk cleanup/maintenance/repairs.
 

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