User Activity reports that are created by Microsoft Forefront Threat Management Gateway (TMG) 2010 show a wrong value in the reported data range. For example, a seven last days report that is created by Forefront TMG 2010 shows the reported data in an incorrect data range.
This issue occurs because the period of time that is reported is calculated incorrectly in Forefront TMG 2010.
To resolve this issue, install the software update that is described in the following Microsoft Knowledge Base (KB) article:
2475183 Software Update 1 rollup 2 for Forefront Threat Management Gateway (TMG) 2010 Service Pack 1
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 view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates