Article ID: 2851280 - View products that this article applies to.
Consider the following scenario:
This issue occurs because a certain flag in Lync for Mac 2011 that prompts the user with a trust model dialog box is not turned on.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2844274/ )Description of the Microsoft Lync for Mac 2011 14.0.5 update
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