Renaming domain's name

How Google is indexing one site after a domain name's rename

[garcia adrian]

Him
I am a newby in how Google index a site. So, here is the question:

We had a site named "www.mysite.es" (we are a spain based company) and 3 month ago we decided to change de domain name to "www.mysite.com". We also decided to maintain the old name so if you go to "www.mysite.es/mypage.htm" you get the same page as "www.mysite.com/mypage.htm" (smae site attending 2 domains).

Now we are finding that we have more than 17000 pages indexed in Gg from "wwww.mysitye.es" and only 587 from "www.mysite.com" using the standard DC. If we use BigDaddy's DC we are getting 11000 pages for "www.mysite.com" and 380 pages for "www.mysite.es". I are assuming that Gg are eliminating the duplicate pages from the results.

What we want to do now is to get all the "www.mysite.com" pages indexed and drop all the "www.mysite.es" from Google. Wich is the best way to do this?

Thanks in Advance.