Prior to WordPress 3.0, WordPress supported one blog per installation, although multiple concurrent copies may be run from different directories if configured to use separate database tables. WordPress Multi-User (WordPress MU, or just WPMU) was a fork of WordPress created to allow multiple blogs to exist within one installation that is able to be administered by a centralized maintainer. WordPress MU makes it possible for those with a website to host their own blogging community, as well as control and moderate all the blogs from a single dashboard. WordPress MU adds eight new data tables for each blog.

WordPress MU merged with WordPress as part of the 3.0 release

After the release of WordPress 3.0, the development team took a release cycle off from the WordPress software to focus on expanding and improving the WordPress community.[49][50] WordPress 3.1 was subsequently released in February, 2011. With version 3.2, released on July 4, 2011, the minimum requirement PHP version and MySQL were raised as well