There's an error in your Outlook Web App configuration The character '%5' isn't valid for file extensions. It was found in ...

There's an error in your Outlook Web App configuration

The character '%5' isn't valid for file extensions. It was found in character %4 of "%3" in element %2 of the %1 array in the Outlook Web App attachment policy for the %6 virtual directory. This can be corrected using the Exchange Management Console.