Try - Run the steps again Severin.

 Ronni Brown’s iPad Pro 12.9-inch 256GB 


> On 19 Oct 2017, at 6:00 pm, Severin Crisp <[email protected]> wrote:
> 
> 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: [email protected]
> ____________________________________________________
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>> On 19 Oct 2017, at 17:41, Ronni Brown <[email protected]> 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 <[email protected]> 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: [email protected]
>>> ____________________________________________________
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