MariaDB 5.5 is MariaDB 5.3 + MySQL 5.5. See "What is MariaDB 5.5" for an overview of what is in MariaDB 5.5. Windows, Linux, and Solaris builds and Debian and Ubuntu repositories are available for this series.

MariaDB 5.3 has subquery optimizations, join enhancements, group commit, dynamic columns, microsecond support and windows performance fixes. See "What is MariaDB 5.3" for an overview of what is in MariaDB 5.3. Windows, Linux, and Solaris builds and Debian and Ubuntu repositories are available for this series.

MariaDB 5.2 contains added features which did not have time to be put into MariaDB 5.1. See "What is MariaDB 5.2" for an overview of what is in MariaDB 5.2. Windows, Linux, and Solaris builds and Debian and Ubuntu repositories are available for this series.

MariaDB 5.1 is based on the corresponding version of MySQL, but with added features, storage engines, and bug fixes. See "What is MariaDB 5.1" for an overview of the differences. Windows, Linux, and Solaris builds and Debian and Ubuntu repositories are available for this series.