Question about Outlook Express

I have updated my outlook.  I was able to add the me.com to the outlook on my iMac.  I would like to add my email account from my pc laptop.  I keep getting an error message, asking me to redo the password.  I have checked with my provider and redid my password and everything works fine  I am able to send messages from this computer.  I am doing something wrong, not sure what to do.  New to the mac.