Article ID: 2561530 - View products that this article applies to.
Consider the following scenario:
This issue occurs when a file in a temporary folder has the same file name as the text file that you download. When the Group Chat client user clicks Open to download the file, the Group Chat client replaces bytes in the existing file and then creates a merged file.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2636065/ )Description of the cumulative update for Lync 2010 Group Chat client: November 2011
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