e-mail Help

I couldnt find a better place to put this so I guess this is where I should ask.

I am a major newbie with this stuff so here it goes.

I have a colocated server that is running red hat 9. I am trying to configure some pop3 mail accounts. I have 2 different web interfaces that I can use. One is the companies web interface and the other one is plesk. I am trying to set up a pop3 e-mail account for my name server. I can make a new mail account and access it through the webased e-mail, but I am having trouble accessing it through outlook. I read the manulas for my server and seached the plesk manual but cannot find anything. Can someone guide me in the right direction? Thanks for any help.