How to Move Posts From WordPress 2.0.2 to 2.9

1. Perform a backup of the 2.0 version database, the complete WordPress directory and the access file.
2. Deactivate all the plugins currently enabled in the administration panel in the plugins area.

3. Upgrade the WordPress blog from 2.0 to 2.7 in increments by downloading the required older versions of WordPress from the official release archive. Each updated version should be downloaded, unzipped and then uploaded to the directory named WordPress on the 2.0 server. Overwrite existing files if asked.
4. Login to the administrative area of WordPress and check to see if WordPress is prompting you to do a database upgrade. Confirm that you would like to do an upgrade if you see the notice.
5. Click on the tools menu in the left sidebar of the dashboard, and then on the export link in the drop-down menu that appears. Note the export function choices in the main dashboard area.
6. Choose to export all content by clicking the corresponding radio button. Complete the export by clicking the button labeled 'Download Export File' at the very bottom of the page. Save the exported XML file to your computer.
7. Start importing the XML file containing all your blog posts into your WordPress 2.9 installation by logging into its administration panel, clicking on tools and then on import.
8. Click on the WordPress link in the choices of systems to import from. On the following screen, select the XML file just exported and choose to upload it. Assign authors for your imported posts and the import process is complete.