When a user runs the Microsoft Lync 2013 client, the presence indicator does not update the user's status based on the user's Outlook Calendar.
This problem may occur when the user's primary SMTP address contains uppercase characters.
To resolve this issue, install the Microsoft Lync 2013 updates that are dated February 2013. For more information about the Lync 2013 updates: February 2013, click the following article number to view the article in the Microsoft Knowledge Base:
2812461 Description of the Lync 2013 updates: February 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.