Shoutbox

You should just be able to add the settings and check the SLL Required box, and it work. If it doesn't yet still works in Outlook Express, then it may be an account that can only work with Outlook (though I can't imagine why).

Edit: Sorry, this post probably didn't help too much. I've not used the POP3 feature in Plus! for a long time, as all my e-mail is tracked by Windows Live Mail (the downloadable program), which I recommend by the way, as it alerts you via toasts to any message that comes to any account. And it'll handle Hotmail and GMail accounts flawlessly too.