You have multiple conversation sessions open in Microsoft Lync 2013 in Windows 8 or Windows Server 2012.
You receive a message in an inactive conversation window.
You point to the Lync icon on the taskbar.
In this scenario, the thumbnail preview does not show which conversation received new messages.
The expected action is that the window that has received a new message is highlighted.
This issue also occurs in Windows Live Mail 2012.
To resolve this issue, install update rollup 2855336. For more information about how to obtain this update rollup package, click the following article number to go to the article in the Microsoft Knowledge Base:
2855336 Windows 8 and Windows Server 2012 update rollup: July 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to go to the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates