If you are having a problem running a Lync SDK based application you may need to uninstall Microsoft Attendant 2010 and repair Office.
- Is Attendant 2010 installed on this computer? If it is, uninstall it.
- If Attendant 2010 has been installed on this computer in the past, perform a repair install of Office 2013. You can do this in Programs and Features in the control panel.
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http://windowspbx.blogspot.com/2015/05/microsoft-lync-attendant-2010-causes.html
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