Upgrade from Drupal 6 and Views 2 to Drupal 7 and Views 3

Hi Drupal community,

I have problems with upgrading to Drupal 7 and importing old Views.

During the standard upgrade routine everything works fine and I updated Drupal Core to 7.8 and all modules I used. Now I realized that all views have broken handlers, because I migrated the CCK content to Drupal fields (integrated in Drupal 7) with the CCK Module for Drupal 7. The migration of content types finished successfully.

I also tried to export the views (Views 2 and Views 3 with Drupal 6) and import (Views 3 in Drupal 7). But then there are many error messages:

- "Filter criterion handler xyz is not available"
- "Relationship handler xyz handler is not available"
- "Field handler xyz handler is not available"

I could solve "Field handler"-errors by correcting the export data and renaming the field names. But it is much work.

What is the best method to upgrade Views so that handler will not be broken?

Is there a upgrade script for Views data for a migration from Drupal 6 to Drupal 7?