While 5 million pages is a very big number (that probably requires a lot more planning) this might be the Google document you are looking for: http://support.g

While 5 million pages is a very big number (that probably requires a lot more planning) this might be the Google document you are looking for: http://support.google.com/webmasters/bin/answer.py?hl=en&answer=83105 http://support.google.com/webmasters/bin/answer.py?hl=en&#38... Moving your site If you're planning on moving your site to a new domain, here are some tips that will help you retain your site's ranking in Google's search results. Edit: http://www.mattcutts.com/blog/moving-to-a-new-web-host/ http://www.mattcutts.com/blog/moving-to-a-new-web-host/ (2005) http://googlewebmastercentral.blogspot.nl/2008/04/best-practices-when-moving-your-site.html http://googlewebmastercentral.blogspot.nl/2008/04/best-pract... (2008)