Andrus,

Check Wikis links:

AutomatedEmail
http://fox.wikis.com/wc.dll?Wiki~AutomatedEmail~VFP

SendSmtpEmail
http://fox.wikis.com/wc.dll?Wiki~SendSmtpEmail~VFP

The last one -- though it is about SMTP, but you can get an idea how to manage POP3 from this code.
You need POP3 description -- http://www.faqs.org/rfcs/std/std53.html

There is an example (alas, members area) on my site too
Winsock: reading email messages (POP3, port 110)
http://www.news2news.com/vfp/?example=388

And VB example, which I have found to be extremely useful:
How to receive an e-mail (Introduction to POP3 protocol)
http://www.vbip.com/winsock/winsock_pop3.asp