Microsoft small business knowledge base

Article ID: 2757458 - Last Review: June 27, 2014 - Revision: 12.0


When you try to edit your contacts in Lync 2010 or Lync for Mac 2011, you receive one of the following error messages:
Cannot add, move, or remove contacts or groups at this time. Please try again later.
Your contact list cannot be edited in UCS mode using Microsoft Lync for Mac.  Please contact your system administrator.


This issue occurs because the user’s contact list was migrated to the Exchange Unified Contact Store (UCS). This is a new integration feature of Exchange Server 2013 and Lync Server 2013.  After the migration, the user’s contact list provider changes from Lync Server to UCS.

Even though Lync 2010 and Lync for Mac 2011 can read the UCS contact list, they can’t change contacts or groups in the UCS.Therefore, users who are enabled for the UCS can't change their contacts list from Lync 2010 and Lync for Mac 2011.


To resolve this issue, use Lync 2013, Outlook Web Access 2013, or Outlook to change your contact list.

Or, you can roll back the user’s contacts to Lync Server and users will then be able to change their contact list.
  • For Lync Server, go to the following Microsoft website:
    Roll back Migrated Users (
  • For Lync Online, go to the following Microsoft Knowledge Base article:
    2811654  ( ) Lync contact list is empty or read-only after a user's Exchange mailbox is disconnected, unlicensed, or moved


On Windows, to confirm if a user is enabled for UCS, right-click the Lync icon in the notification area to open the Lync Configuration Information screen. Look for the Contact List Provider line.  Either UCS or Lync Server appears.

Still need help? Go to the Office 365 Community ( website.

Applies to
  • Microsoft Lync Online
  • Microsoft Lync 2010
  • Microsoft Lync for Mac 2011
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