Duplicated Lync contacts in Outlook (Lync 2010, Lync 2013, Outlook 2010, Outlook 2013)

This is an well-known bug in Lync with Exchange/ Outlook.
It seems like, the Lync-Outlook connection is somehow bouncing.

There are several solution, based on your Lync environment, but independent from the Outlook version.

First with Lync 2010 Client:

You need to start navigating to the Client OPTIONS and uncheck under contact the "Save my Lync contacts in my personal contacts folder on the Exchange server check box"

If you have Lync 2013 (15.0.4517.1005 or newer) or Lync 2010 (4.0.7577.4419 or newer) installed there is only one other option.
Lync 2013 Client Update May 2014: http://support.microsoft.com/kb/2880980

- Lync Server 2010
  Upgrade your system with CU5

- Lync Server 2010 CU 5 and Lync 2013 (any CU)

You must change your Lync Client Policy

Set-CsClientPolicy -Identity Global -EnableExchangeContactSync $False

another option is, since not all clients are affected, you build another ClientPolicy with this option disabled.

New-CsClientPolicy -Identity OutlookContact -EnableExchangeContactSync $False

Deleting the Contacts:

After you have changed this setting and they are applied to the user, he is able to delete the duplicated contact in Outlook.
If you still facing problems deleting the contact, go to Outlook Web Apps and delete them in a browser.


  1. There is one situation that it was not covered.. when it's happening in Office 365 and the Lync Server is managed by MS...

    1. Hi Luis,
      since I'm not the ultimate Office365 guru. But in Office 365 are not Client Policies with in-band provisioning.
      You should be able to find this settings in the Office ADMs (Templates) and restrict the same.
      As info, Client Policies in in-band provisioning will always overwrite office template/ registry settings


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