As far as your own modules are concerned, you can get an overview of the API changes and what that would entail at: http://drupal.org/node/224333 - obviously the complexity of your custom module code will be the determining factor here.

For contrib modules, this will depend heavily on how many you are using and which. Many of the major ones have made a commitment to have a release ready when Drupal 7 is released.

Best, William

On Thu, Apr 15, 2010 at 6:18 AM, John Mitchell mitchelljj98@gmail.comwrote:

How hard will it be to upgrade from Drupal version 6 to Drupal version 7 when version 7 becomes the latest stable version?

This includes the upgrading of any added modules including any custom modules that I write myself.

Thanks,

John

-- John J. Mitchell -- [ Drupal support list | http://lists.drupal.org/ ]