Problem sending Hotmail email thru Outlook Express

Is it not possible to send (hotmail) email thru Outlook Express or
Incredimail. I get an error message that says either 'Forbidden' or

Access to the account was denied. Verify that your username and password are
correct. Account: 'Hotmail', Server:
'', Protocol: HTTPMail,
Server Response: 'Forbidden', Port: 0, Secure(SSL): No, Error Number:

I used to be able to send Hotmail email thru both Outlook Express and
Incredimail and now I can't.
Is there anything wrong?

Thanks in advance for any information.