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It will be the phone most likely, but could also be something like a CRM application. <br />
<br />
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. <br />
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. <br />
<br />
Simon.
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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.

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I found a solution for the problem
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Hello experts<br />
<br />
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)<br />
<br />
What is tha cause of This and more importantly how to solve this?<br />
<br />
Important the user has an Hiphone and synchronizing data with &nbsp;outlook<br />
<br />
Rgds
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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

duplicate contacts for User in Exchange 2010

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

A contact manager in its most basic form is a software program that enables users to easily store and find contact information, such as names, addresses and telephone numbers. Sophisticated contact managers provide calendar sharing features and allow several people in a company to access the same database. Some contact management systems have evolved into customer relationship management (CRM) systems to analyze and plan for an organization’s interaction with current and future customers.