Account Lockout

We have a user on our domain whose account keeps getting locked out.  I installed the lockout tools from microsoft and from doing an event comb the computer that keeps sending pre-authentication failures is the mail server.
The events i see are in the attached file
IP is the mail server
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someone is trying to hack the users email
Delphineous SilverwingGood Ol' GeekCommented:
There is a possibility that the person left Windows logged in and Outlook open at another workstation, then at some point changed their password.  Since this other location is still logged in, using a persistent application like Outlook, the user account locks out.  Check your security logs for the IP address of the failure audit source - now you have the machine cause the lockout.
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jduawaAuthor Commented:
The log indicates the ip is the mail server.

There are 175 computers in the school that the user could have logged into, but unlikely that they left any session logged on, any other thoughts

Delphineous SilverwingGood Ol' GeekCommented:
Is Outlook Web Access offered?  If a session were left logged on in a browser using the "This is a private computer" selected, then the mail server would show as the source.
jduawaAuthor Commented:
i tried sending bad passwords while logging into OWA and it was a different message than the 675 that is in the event viewer

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