Forum Moderators: phranque
Redirect permanent / [example.com...]
in the root-level .htaccess of the old site (where example.com is the URL of the new site).
As a basic plan, you could point the DNS of the old site to toward the new server, then use .NET to script something with the 404 error page, redirecting if possible to an appropriate new page (with a 301 redirect header) based on the requested filename or search engine referrer string if available, serving a true 404 if nothing is found. How easy this is, I can't say, but .NET is reputed to be powerful stuff!