We are going to Drupalcamp Stockholm. Are you? Register at http://spring2014.drupalcamp.se/ We have just submitted two session also. One about Drupal-to-Drupal migration and one about .NET/SQL to Drupal migration. So if you need to know more about how migrate works in Drupal please join us there. And migrate is very good to know as it is the way to upgrade sites to Drupal 8.