We have recently added a free subdomain for SEO purposes. We are getting a high position in searches, but the problem is Google is not showing our main website in some of our keywords any more.
I have read in blogs that there is no connection between domains and subdomains regarding SEO, but it seems to be wrong. Our main website (
example.com) has a PR=5 and our subdomain (
free.example.com) has a PR=3.