Sorry, but can't buy the "all day" thing. A number of hours back, both mail and webmail.spamcop.net servers were down. However, they've both returned to service, connectivity to the Reporting servers was re-established ... most of this documented (a bit) in the Announcements section. Other than the period that the mail servers were actually down, there is no one else reporting connection issues. Appearances at this point would be that something has changed in your Outlook configuration.
Possibly see
http://support.microsoft.com/default.aspx?...kb;en-us;827349Google finds other suggestions that deal with anti-virus scanning of e-mail ... perhaps settings involved in your anti-virus tools are involved?