This latest release featured an all new UI, with a new blue color scheme replacing the tired white one. More importantly, 2.0 introduced AJAX, making the most common tasks more efficient and improving back-end performance.
WordPress 2.0 also took the first steps towards the rich text editor we use today, with the introduction of a WYSIWYG editor. This took a lot of the guesswork out of formatting your blog posts.
Although post previews were introduced in version 1.2, WordPress 2.0 took this a step further. In a post-2.0 world, users could preview posts on the front-end of their websites – resembling the preview feature we use today.
Another important one, WordPress 2.0 was the first release to introduce user roles. This new feature allowed you to configure permission levels for different site users.