Try this Microsoft 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"
That page offers two download options. Unless you know for sure
you have 64-bit Vista, use the 32-bit option.
--
Gary VanderMolen [MS-MVP WLM]
"jose" <(E-Mail Removed)> wrote in message news:1C11FF86-C8C4-4EFF-8951-(E-Mail Removed)...
> Hello there!
>
> I have certain email that have being sent but now a copy remains in my
> outbox of my windows mail but everytime I try to delete them I get an error!
>
> Does anybody knows how to delete this emails?? I have tried Shift+Delte does
> not work, ATD + E then delete does not work!
>
> Anybody knows how to solve this anoying problem?????