Yes, its a bug and here's the fix:
http://support.microsoft.com/default.aspx/kb/941090
"Messages may be stuck in the Outbox when you use Windows Mail on a computer
that is running Windows Vista"
It works on other folders in addition to the Outbox.
Hal
--
Hal Hostetler, CPBE --
hhh@kvoa.com
Senior Engineer/MIS -- MS MVP-Print/Imaging -- WA7BGX
http://www.kvoa.com -- "When News breaks, we fix it!"
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"Anthony B" <no.spam@no.spam.com> wrote in message
news:%23kjATVmTIHA.5164@TK2MSFTNGP03.phx.gbl...
> Well, I got a stuck message in my outbox.
> When I tried to open it, it show "message could not be display".
> When I tried to delete it, it show "an unknown error has occur".
> When I tried to move it, it show "an unknown error has occur".
>
> When I used option, maintenance, to delete message, it is still there.
>
> I think its a Microsoft bug. Any solution, except to reload the entire
> Vista?
>