Vista Tutorial - Bug: Incorrect security message

When clicking a link on a web site to provide feedback via e-mail (one that
starts with 'mailto:'), a window pops up asking for permission to start the
default mail program (in my case Outlook 2007). The window has two options:
Allow and Don't allow. That's good! But after clicking Don't allow, a message
appears "Could not perform this operation because the default mail client is
not properly installed".

Huh? The message should be "Could not perform this operation because you
didn't allow me to" or rather, no message at all because I just clicked Don't
allow a split second ago so I *know* it can't perform the operation and I
also know why.