Page is a not externally linkable
contentwithcontent - 6:33 am on Nov 5, 2006 (gmt 0)
subdomain.x.com and www.x.com are considered two different domains. if you had a link to www.x.com/interiorpage.htm it WOULD improve www.x.com but a link to subdomain.x.com would not improve www.x.com in my understanding and experience.
To answer that question i would say that it does not. Explanation...