Since there is no Outlook Express on Vista, I assume you mean Windows Mail.
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 Hostetler, CPBE -- hhh@xxxxxx
Senior Engineer/MIS -- MS MVP-Print/Imaging -- WA7BGX http://www.kvoa.com
-- "When News breaks, we fix it!"
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"hobs" <hobs@xxxxxx> wrote in message
> When I try to send mail from outlook ex I receive a ;m,eesgae could not be
> displayed error' says low memory butthat is not the problem"