Symptoms
Consider the following scenario:
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You log on to Microsoft Lync 2010, and then you click Conversations to view a conversation history.
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You delete the conversation history of a contact that is not in your contact list.
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You close the conversation history view.
In this scenario, Lync 2010 still polls for the non-listed contact's conversation history. This issue occurs until you log off from Lync 2010.
Resolution
To resolve this issue, install the following cumulative update:
2551268 Description of the cumulative update package for Lync 2010: May 2011
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.