EXPERT RESPONSE
Although there are a large number of requests for such a feature, there are surprisingly few, if any, solutions to do what you need in an "out of the box" manner. However, if you don't mind getting down and dirty with log files, then you can analyze the Internet Information Services (IIS) log files for any entries relating to OWA access.
You can also use a utility such as Log Parser 2.2 to do the log mining for you. Check out the MSExchange.org article "Using the Log Parser utility to analyze Exchange/IIS logs" for details on how to use the Log Parser tool.
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Expert Advice: Checking logs for OWA logon attempt
Tip: Digging into Exchange IIS logs
Learning Center: Exchange Server and Internet Information Services (IIS)
Reference Center: Outlook Web Access tips and resources
Reference Center: Exchange monitoring and logging resources
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