Q&A Program which can sync ,import and export and unify contacts?


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Thread author
Mar 23, 2021
Is there a program (or a method) capable to import all CONTACTS one could have on Thunderbird,GMail,IPhone and MAC computers?
This in order to have all available contacts in one place,but at the same time being able to import-export from each one of them, just contacts,nothing else.
I've seen CLOZE (Cloze - Relationship Management, Inbox, and Contacts in One App) and OPEN CONTACTS (14 Open Contacts Alternatives – Top Best Alternatives) have similar skills as required,but I
am not too confident they can do what promised. Anyone can shed light?