PlusFan, the type of computer doesn't matter... POP3 is POP3... it's a protocol, it has nothing todo with the type of computer you're using (mac or pc).
Mike2, furthermore, because it is a protocol, even the type of programs doesn't matter ("allows you to use it from incredimail, outlook etc"): A server doesn't know which programs you use to read the mail... of course your program needs to be able to read and use the POP3 protocol...