WordPress started in 2003 with a single bit of code to enhance the typography of everyday writing and with fewer users than you can count on your fingers and toes. Since then it has grown to be the largest self-hosted blogging tool in the world, used on hundreds of thousands of sites and seen by tens of millions of people every day.
b2\cafelog, more commonly known as simply b2 or cafelog, was the precursor to WordPress. b2\cafelog was estimated to have been employed on approximately 2,000 blogs as of May 2003. It was written in PHP for use with MySQL by Michel Valdrighi, who is now a contributing developer to WordPress. Though WordPress is the official successor, another project, b2evolution, is also in active development. WordPress first appeared in 2003 as a joint effort between Matt Mullenweg and Mike Little to create a fork of b2. In 2004 the licensing terms for the competing Movable Type package was changed by Six Apart, and many of its users migrated to WordPress – causing a marked and continuing growth in WordPress's popularity.
WordPress releases are named after well-known jazz musicians. For example, WordPress 1.2 was code named Mingus (after Charles Mingus).
WordPress 1.5 was released mid-February 2005 and code named Strayhorn. It added a range of new vital features. One such is being able to manage static pages. This allows content pages to be created and managed outside the normal blog chronology and has been the first step away from being simple blog management software to becoming a full content management system. Another is the new template/theme system, which allows users to easily activate and deactivate "skins" for their sites. WordPress was also equipped with a new default template (code named Kubrick) designed by Michael Heilemann.
WordPress 2.0 was released in December 2005 and code named Duke. This version added rich editing, better administration tools, image uploading, faster posting, an improved import system, and completely overhauled the back end. WordPress 2.0 also offered various improvements to plugin developers.
On 22 January 2007, another major upgrade, WordPress 2.1, code named Ella, was released. In addition to correcting security issues, version 2.1 featured a redesigned interface and enhanced editing tools (including integrated spell check and auto save), improved content management options, and a variety of code and database optimizations.
WordPress 2.2, code named Getz, was released on 16 May 2007. Version 2.2 featured widget support for templates, updated Atom feed support, and speed optimizations. Wordpress 2.2 was initially slated to have a revised taxonomy system for categories, as well as tags, but a proposed revision led to the feature being held back from release.
WordPress 2.3, code named Dexter, was released 24 September 2007. Version 2.3 features native tagging support, new taxonomy system for categories, easy notification of updates as well as other interface improvements. 2.3 also fully supports Atom 1.0 along with the publishing protocol. WordPress 2.3 also includes some much needed security fixes.
WordPress 2.5, code named Brecker, was released 29 March 2008. Developers skipped the release of version 2.4 so version 2.5 contained two releases worth of new code. WordPress 2.5 saw a complete overhaul of the administration interface and the WordPress website was also redesigned to match the new style.
WordPress supports one weblog per installation, though multiple concurrent copies may be run from different directories if configured to use separate database tables. Wordpress Multi-User (Wordpress MU) is a fork of WordPress created to allow simultaneous blogs to exist within one installation. Wordpress MU makes it possible for anyone with a website to host their own blogging community, control, and moderate all the blogs from a single dashboard. Wordpress MU adds eight new data tables for each blog. Lyceum is another enterprise-edition of Wordpress. Unlike WordPress MU, Lyceum stores all of its information in a set number of database tables. Notable communities that use Lyceum are TeachFor.Us (Teach For America teachers' blogs), BodyBlogs and the Hopkins Blogs.