Anybody Here Good with Computers?

My dad signed up for a Yahoo! email. He is wanting to cancel his PeoplePC account. Before he cancels it, he wants to move all of his emails from that account over to his new email on Yahoo! and I can't seem to figure out how to do this. I've checked the "Help" section in PeoplePC mail and didn't find anything. Please help me, I'm so clueless when it comes to things like this. If you have any questions, ask and I'll be sure to clarify anything. Thanks so much!

Couldn't he just like... forward them or send them to his new account or something?

I don't think that's possible.
Just forward them. It'll take forever, but if he really wants to keep them, it's his best bet.

When I moved and changed my email, I sent out stuff to everyone with my new one. For some reason my old provider has left my email capability on and I still find occasional things from people accidentally put there, but eventually, they all get the clue. And, it was a pain in the backside doing it. Good luck.