Article ID: 2459953 - View products that this article applies to.
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After you upgrade from Microsoft Office Communicator 2007 R2 to Microsoft Lync 2010, Lync 2010 may crash or stop responding.


Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To resolve this issue, follow these steps:
  1. Close all instances of Outlook and Communicator or Lync.
  2. Delete all the files that are located in the following folders:
    • %userprofile%\tracing
    • %localappdata%\Microsoft\Communicator\ (If you are running Windows Vista or Windows 7)
    • %userprofile%\Local Settings\Application Data\Microsoft\Communicator (If you are running Windows XP)
  3. Click Start, type regedit, and then press Enter.
  4. In Registry Editor, locate and then delete the follow registry subkey:
  5. Exit Registry Editor.


This issue occurs because during the installation process, Lync 2010 adds any known contacts to the default Contacts folder in Microsoft Outlook. Be aware that a best practice is to uninstall Communicator 2007 R2, restart the computer, and then install Lync 2010.

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


Article ID: 2459953 - Last Review: June 26, 2014 - Revision: 23.0
Applies to
  • Microsoft Lync Online
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Home Edition
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