Can I import my old free stats to my new PRO account?

Absolutely! There is an option to do this in the "Websites" section of the PRO Control Panel, you'll need your old free sitekey which you can find in the address bar of your free stats pages, it is an 8 to 12 character alphanumeric code.

One thing to keep in mind - when you import your free stats it will overwrite any PRO stats you've collected so we only recommend you import your free stats right after you setup your PRO account, just after you replace the free widget code on your site with the PRO widget code.