I upgraded from
- closed
AddressBook .app - opened a Finder window or Terminal
- went to /Users/yourname/Library/ Application\ Support/AddressBook
- made a copy of AddressBook.data named AddressBook.data.bak (for safety)
- renamed AddressBook.data.beforesave to AddressBook.data
- started AddressBook.app and checked everything is there: yes!
A possible explanation is that I used AddressBook with vCard 2.1 (the default is now 3.0), so the upgrade overlooked my existing addresses, luckily without deleting them.
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personalmente, NON ho avuto questo problema (ne’ altri, al momento) aggiornando l’OS…
Infatti è raro.