Article ID: 2488159 - View products that this article applies to.
Consider the following scenario:
Note The Show Columns option is located in the View menu in a Group Chat client.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2491973/ )Update package for Office Communications Server 2007 R2 Group Chat server: March, 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
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