Unable to send email after SP3 Update

I

Ian S

I have a college in a remote location with limited
connection time. He has downloaded SP3 for Office 2003
and now cannot send email.
Error Mesage is "Unable to send as you do not have a
Digital ID Certificate."

Outlook was working before the update and now has stopped
(receiving is fine and connection to internet is ok).
Does anyone know if the update has changed a setting
somewhere?
Thanks for any help.
 
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