"WP Post Corrector" is a plugin, helpful you to correct your post data. It contains mainly 3 modules. Bulk Upload (Insert Mass Post Data),
This plugin supports only Microsoft excel format while get backup and CSV format from Microsoft excel only for Bulk Upload and Bulk Update. No other formats are supported.
You can insert 800 to 1000 posts at a time. It meanse you can insert that many post with complete data in the csv file and uplod or update at a time.
once you have installed this plugin, you can see the "WP Correct" link from wp-admin > Tools (left menu) > WP Correct.