duplicate contacts for User in Exchange 2010

Hello experts

I have a User who is using outlook 2013 and the E-mail Server is Exchange . Suddenly the user is having duplicate contacts in his outlook ( Like the same contact 10 times)

What is tha cause of This and more importantly how to solve this?

Important the user has an Hiphone and synchronizing data with  outlook

Rgds
gazambeyIT CONSULTANTAsked:
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Simon Butler (Sembee)ConsultantCommented:
It will be the phone most likely, but could also be something like a CRM application.

If you change the contacts to Category view, you can add Created Date. You will probably find that the creation date for the duplicates is the same.
Very common unfortunately, it is usually caused by a third party app touching the contact and modifying it in such a way that the device and/or Exchange thinks it is a new contact.

Simon.
gazambeyIT CONSULTANTAuthor Commented:
Hello

I found a procedure to reconciliate contacts and remove duplicates here :

https://www.ablebits.com/office-addins-blog/2013/11/29/merge-outlook-contacts-prevent-duplicates/

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gazambeyIT CONSULTANTAuthor Commented:
I found a solution for the problem
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