Article ID: 2517728 - View products that this article applies to.
Consider the following scenario:
Connection to Microsoft Exchange is unavailable because you signed in directly on the phone.
This issue occurs because the UsingPINAuthentication registry value is set to 1.
To resolve this issue, install the following cumulative update.
For Aastra 6721ip and Aastra 6725ip telephones:
(https://support.microsoft.com/kb/2529978/ )Description of the cumulative update for Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip: April 2011
For Polycom CX500, Polycom CX600 and Polycom CX3000 telephones:
(https://support.microsoft.com/kb/2529977/ )Description of the cumulative update for Lync 2010 Phone Edition for Polycom CX500, Polycom CX600 and Polycom CX3000: April 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 2517728 - Last Review: June 21, 2014 - Revision: 2.0