Account locked by OWA access

We have Exchange 2003 with OWA enabled.
We have noticed that some user accounts started being locked by passwords wrongly typed (OWA intusion try).
As a first workarround, we have disable user's OWA access but this was not successfull.
I know that OWA first verifies Username and Password, and then, checks if user has access to OWA.
Is there any way to make OWA first check if the user has access to it, and then, if passed, verify Username and Password? By this was, this kind of intrusion will not lock the user account anymore.
Any other suggestion is also wellcome.

Att
Marcelo
fmarcelo14Asked:
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MidnightOneCommented:
That would defeat the purpose of a password.

The way the process currently works is "try username/password combination", and if it passes, check for access rights.

Your method tries to check a username for access rights based on anonymous credentials - that's a massive security hole.
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fmarcelo14Author Commented:
Some accounts are being blocked by the Webmail access (denial of service - user account), how to block these attacks?
 My AD has a policy to lock the user account after 5 failed login attempts with wrong password.
Best regards,
Marcelo
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MidnightOneCommented:
You'll need to figure out where they're coming from and block them at the firewall. Does the security logs give you this information? Is security auditing on?
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