Broken Links: Moved site, Changed Domain Name

I was wondering if someone has come across this same issue and knows how to resolve it.

The setting:
– Moved WordPress site from Linux Apache to Windows IIS 7
– Changed subdomain so both sites could operate simultaneously until moved,
eg. http://www.domainname.com to www3.domainname.com

What has been done so far:
– MySQL database duplicated on Windows server and set up accessible.
– PHP installed on Windows and working, WP site copied.
– Registrar DNS setting updated and site accessible through www3 subdomain.
– Searched the MySQL DB * all new domain URLs updated.
– So the MySQL DB is accessible to WP with all necessary access rights.

What is happening:
– The home page is displayed okay, but all links on the home page pull a 404 error, not just the menu.

– The proper URL is displayed (when you hover over the link and look in the status bar, that link is what it should be)

** It is as though the connection in WP that maps a “virtual URL” to a WP page is broken for all links. **