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"
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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"joesocwork" <joesocwork@discussions.microsoft.com> wrote in message
news:05359482-61D6-4464-BE93-8289E4058729@microsoft.com...
> I am getting "unknown error" when deleting individual posts. I get
> absolutely no response to emptying the Delete folder. I've WMUTil.exe
before
> and found it quite useful, but it does not help in this case. Feedback on
> how to delete items in the Delete folder would be appreciated!