Does Google see http://www.Microsoft.com and http://software.micorsoft.com as two different domains? When I do site:www.microsoft.com and site:software.microsoft.com I get different results?
http://www.google.com/search?client=safari&rls=en&q=microsoft&ie=UTF-8&oe=UTF-8 Google gives 2 results per domain max and 2 per subdomain max. Try it!
Absolutely. That's right. You only see the results that belong to the choosen subdomain. If you do site:example.com, you get the results for all subdomains. Jean-Luc