As some smartphone are used for Business and personal I think you have choice to use Outlook internal App Contact and not sync with the sma
Outlook Contacts

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2 comments
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RECRUE-NIVEAU-SUPÉRIEUR-COMMAND 34BNSC commented
Seems to be working with Android...is this true?
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RECRUE-NIVEAU-SUPÉRIEUR-COMMAND 34BNSC commented
Is this option compatible with Android smartphone? As you stating IOS....