Software

A few months ago, I lost my Comcast e-mail because the roommate I had previously canned her service. Along with it I lost a bunch of e-mail addresses. I was told by Comcast that the address book file should still be on my computer. The question I have is where do I find it? I've run searches for it numerous times without any sort of lead. I know I can import it if I can just find what file it's in. Anyone know where this one is stored or where it can be found?