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The Presence calendar data does not publish in Lync 2010 after users install update 2496325
Article ID: 2560101 - View products that this article applies to.
Consider the following scenario:
This issue occurs because of an error when the calendar capability of the user A is processed. The error is caused by a case-sensitive comparison of the SMTP address.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2571543/ )Description of the cumulative update package for Lync 2010: July 2011