Interesting Ronni.   After several passes it says there are no more duplicates 
but in fact it is now down to two of each card!  
Severin
____________________________________________________

             Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
                  ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
        Mob 0484 624 741   mail  to: sevcr...@westnet.com.au 
<mailto:sevcr...@westnet.com.au>
____________________________________________________










> On 19 Oct 2017, at 17:41, Ronni Brown <ro...@mac.com> wrote:
> 
> Hi Severin,
> 
> Using you Mac is the most efficient approach and there’s a handy tool 
> built-in with macOS. 
> NB: Don’t forget to make sure you’ve got a copy of your contacts backed up 
> somewhere before making changes.
> 
> 1.  Start by launching the Contacts application. 
> 2. Make sure All Contacts is selected in the top left corner of the window 
> (this will include local and cloud stored contact cards).
> 
> 3. In the menu bar click on Card → Look for Duplicates…
> 
> 4. Next, a pop up window will let you know how many duplicates will be merged 
> if there is different information on cards that share the same name and also 
> if some duplicates will just be removed (this is automatic and in this 
> example all the duplicates are being cleaned up by merging).
> 
> 5. Click Merge and you’re done!
> 
> 
> Cheers,
> Ronni
> 
> 13-inch MacBook Air (April 2014)
> 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
> 8GB 1600MHz LPDDR3 SDRAM
> 512GB PCIe-based Flash Storage
> 
> macOS High Sierra 10.13
> 
>> On 19 Oct 2017, at 5:23 pm, Severin Crisp <sevcr...@westnet.com.au 
>> <mailto:sevcr...@westnet.com.au>> wrote:
>> 
>> I have 3 iOS devices and  2 OSX (High Sierra) desktops and all share the 
>> address book.   Following some recent family messaging mixups due to sharing 
>> information on single cards rather than having separate cards  (this is 
>> historical) I set about a clean up doing my operations on one or other of 
>> the two OSX machines.  This has proceeded fine apart from the fact that on 
>> my MacAir I now have four copies of each card.   I have not a clue why!  The 
>> “master” information held in the cloud  is fine.   I suspect the way is to 
>> reinstall OSX, maybe from the Recovery sector.  
>> All advice welcome
>> Severin Crisp - in quadruplicate
>> ____________________________________________________
>> 
>>              Assoc Prof R Severin Crisp, FAIP, FIP, CPhys
>> 15 Thomas St, Mount Clarence, Albany, 6330, Western Australia
>>                   ph (08) 9842 1950 ( Int'l +61 8 9842 1950)
>>         Mob 0484 624 741   mail  to: sevcr...@westnet.com.au 
>> <mailto:sevcr...@westnet.com.au>
>> ____________________________________________________
> 
> 
> 
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