I have used POP3 for many and many years and always used PST files for back-up purposes. I'd like to be able to create a searchable mail archive of this 12GB worth of e-mail.
I had used Horde + Qmail for a while for searching e-mail, but it was truly horrible and even extremely slow when searching into a few ten thousands of e-mails, let alone more than a million.
I would prefer a free solution that would provide fast searching through historical e-mails. Also, preferably hosted on a server, so I don't have to worry about backing up any more crucial data on my desktop.