I signed up for SpamCop.net about two months ago and love it. It's web based email so you can access it anywhere, anytime, anycomputer. You can configure your Outlook Express to POP down the email from SpamCop too.
You can either use
xxxxxx@spamcop.net as your email, or continue to use your current
xxxxxx@yourisp.com. If you use your current email, you configure SpamCop to pop down your email from your ISP account, then you re-configure Outlook Express to POP down from Spamcop.net, and have it send as normal.
SpamCop also deletes all email with viruses, you never see them, and they never arrive locally on your PC, so there is no chance of infection unless it is a brand new virus that no filters are catching.
The great thing about SpamCop is you can use it to report Spam back to the ISPs. Somehow the spammers must find out you are reporting them, and they drop your email off their lists, because I've gone from 130-150 spam messages a day to less than 10, and 99% of those end up in my Held Mail folder, not my Inbox. You do have to remember to check your Held Mail once a day, because legitimate email will occasionally get in there.
I usually login into SpamCop Web Mail first thing in the morning ( before I start Outlook), delete email I don't want, and report overnight spams. That way my Outlook only POPs down the mail I want to keep anyway. I do the same thing before I go home in the evening, and use the webmail login exclusively from home.
See
http://www.spamcop.net/ and click on the filtered email accounts. They have options for both individuals and enterprise wide.
The individual is $30/year, and well worth it.