Passage: Originally, OTRS supported only the use of a MySQL RDBMS for use as the webserver database. Support has since been added for PostgreSQL, Oracle, DB2, Microsoft SQL Server, and MariaDB (a community-developed fork of MySQL). OTRS may be used on many UNIX or UNIX-like platforms (e.g. Linux, macOS, FreeBSD, etc.) as well as on Microsoft Windows.

Question: Which webserver database is also used on Microsoft Windows?
OTRS