I have a few clients still clinging to POP3 mail accounts and the newest version of the Windows Mail client doesn't work with it. Instead you will need to install the desktop version of Windows Live Mail. This can be found here: http://download.live.com When you grab it, only install the mail component and when that is done, go into Start, find the Windows Live Mail shortcut and set up your beloved POP3 account. Enjoy
Angus Beath's Blog - a jotting down of thoughts, handy to remember things and general BS about the world.