if all you are interested in is POP then the settings for almost any mail program, regardless of vintage, would be essentially the same.
Just plug in the mail servers for GMail and you should be hot to trot.
I've exhausted the best part of my brain looking for a way to continue using my venerable Apple iBook, OS X,10.3.9, Mail 1.3.9, all of which I still revere. It works fine for me, I'm mostly an email kind of guy who works off his lap while gmail labors in the background. When things were harmonious, Mail and gmail worked well together. For the past 10 days, Mail has neither sent nor received a single piece of mail. (Happily, I'm not totally dead, gmail has been solid as a rock. To remedy Mail's failure, I need Google's configuration instructions to start looking for errors in my settings. I'm an inveterate tweaker, and I'm sure I tweaked something when I should have baked a cake. If there's a solitary soul out there who can help me, I'd be very grateful.
Well meaning friends have repeatedly referred me to Google's web site where the elusive "configuration instructions" for Mail.app can be found and I must repeatedly tell them that the instructions at the web site are for Mail 3.0 and up. Remember, I need the settings for Mail 1.3.9! I should state now, I have no interest in IMAP, I use POP exclusively. Be there someone.