Wrong mailbox is pulled up when accessing OWA with correct credentials

I am having issues with remote users that use OWA pulling up other users Mailboxes when putting in their credentials. This has only happened in one instance so far. Three different users are gettting one particular users Mailbox when they log on to OWA. Any ideas?
darovitzAsked:
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shinatyktCommented:
Microsoft has reported a weakness in Exchange Server 2003, which is caused due to a bug in the handling of NTLM authentication in Outlook Web Access.
Systems configured to use NTLM instead of Kerberos (which is the default authentication scheme) may provide users access to mailboxes belonging to other users, which have recently accessed their mailbox. Microsoft Sharepoint Services may cause the configuration to be changed so that NTLM authentication is used instead of Kerberos. It is not possible for a malicious user to control which mailbox to access.

this might help - http://www.microsoft.com/downloads/details.aspx?FamilyId=9542F949-D09B-4199-A837-FBCFC0567676&displaylang=en
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darovitzAuthor Commented:
the tool will not help because our exchange server is updated with the latest service packs and the above is an old tool.  Any other suggestions as this user is really irrated as others can see his email...  I wouldn't be happy either.
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