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Assume that a client that can send invalid culture information joins a conference. For example, a Damaka XAVY client joins the conference. In this situation, the Microsoft Unified Communications Managed API 3.0 (UCMAPI 3.0)-based Microsoft Lync Server 2010 components, such as the Conferencing Announcement Service and the Conferencing Auto Application, crash. Additionally, the following event is logged in the Application log.


This issue occurs because the client sends the invalid culture string "en_US." Then, the UCMAPI 3.0-based Lync Server 2010 components do not handle the invalid culture information correctly.


To resolve the issue, install the following cumulative update:

2793341 Description of the cumulative update for Lync Server 2010, Unified Communications Managed API 3.0 Runtime: March 2013

More Information

For more information about the RegionInfo Constructor (String), go to the following Microsoft website:

General information about the RegionInfo Constructor (String)

For more information about Damaka, go to the following website:

General information about DamakaThe third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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