Log failed OWA login attempts, Exchange 2010

We are on an Exchange 2010/ Server 2k8 R2 environment, and are looking for a way to get a log of any failed login attempts to the OWA.  I would assume that with the correct logging level there would be a way to get the information from the Event Log or maybe the IIS log, but any suggestions on how to narrow down results would be appreciated.
Geo_ITAsked:
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
You can check IIS logs which are saved as Httperr logs

- Rancy
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Geo_ITAuthor Commented:
Rancy,

Thanks much for the response.  I would assume in the httperr logs that what we are looking for is something in the Reason Phrase, is that correct?  If so, can you point me to what we're looking for?
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Try to find with User Email or Alias for the affected and you might get some broad information about the reason of Failure

- Rancy
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Geo_ITAuthor Commented:
We've found some third-party software that will sort through the log files and put them in a more easily readable format.  Thanks much for the information.
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