you shouldn't need to have a paid subscription, you should just be able to slap in the pop details.
Anyway, I'd suggest Thunderbird, you can get it at...
http://www.mozilla.org/products/thunderbird/
I'm not sure if you need the firefox browser to use it, but I wouldn't of thought so.
All of their software is pretty good, so if your also thinking of a browser change I'd recommend it
