ciml - 10:48 am on Mar 28, 2005 (gmt 0)

Google thinks they're different URLs, which they are.

In HTTP and in Google, www.example.com/ and www.example.com are equivalent, but www.example.com/foo/ is different from www.example.com/foo and www.example.com/Foo/. Also, www.example.com/foo/ is different from example.com/foo/

Google also treat www.example.com/index.html as www.example.com even though the rules of HTTP do not.

If the three URLs continue to serve identical content then Google is likely to merge the three, removing two and giving the remaining URL the backlinks from the others. This does not happen instantly, and if you have a part of the page that changes frequently (e.g. latest news or today's date) then Google may find different content when it fetches the URLs at different times.