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Exchange 2003 OWA 404 "file or directory not found" when Colon in the subject line of a mail

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Hi,

This is a very odd one, what makes it more frustrating is its a tough one to narrow down when its working and when its not.

We have seen a small handful of cases on this (ever) where when accessing OWA (event on the back end server itsself) you can logon fine, you can open some mails but not others. With some narrowing down it is those that have colons (these :) in the subject line of the mail.

This seems to be fixed by:

In IIS the Exchange directory / Properties /Virtual directory /Configurations/
davex.dll
Edit unchecked the option "Verify that file exists".
* Restarted IIS, tested with the test mail with special characters, able to access and able to forward that mail.

 

A very odd one but hope that helps someone!!