The report pack supports one IIS log per site and requires the following log file format:
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 Double-click Logging.  | 
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 Under the One log file per: heading, ensure that Site is selected.  | 
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 Click OK.  | 
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 Select the Outlook Web Access link.  | 
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 Read the license agreement and select the I accept the terms in the license agreement check box and click Next.  | 
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 Click Next to begin the installation.  | 
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 In the MessageStats console treeview, expand the Exchange Organizations node and select an organization.  | 
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 Expand the Servers node and right-click an Exchange OWA server.  | 
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 Select Properties.  | 
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 Select the Server Roles tab.  | 
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 Click OK.  |