There could be 2 causes.
When you download mail from our servers,
it normally stays on our server until
you completely download all of it. You
could be setup, however, to leave the
mail on the server possibly causing you
to get it over and over again. In Outlook
Express, go to Tools/Accounts/Mail tab/double
click your email account. Go to the Advanced
tab and make sure the box "Leave
a copy of messages on server" is
not checked. You would only check this
box if you check your mail on 2 computers
and want both computers to get it, in
which case one of the computers should
be set to not leave a copy.
More likely, you are getting
"stuck" on a message either
because it is excessively large or "malformed"
(not in a correct email format). We can
delete the particular message for you
or you can do it in WebMail.
Click WebMail
to login to your email account online
(after closing Outlook Express), and delete
your unwanted messages there, including
the one getting "stuck". Then
you should be able to retrieve your mail
in Outlook Express!