"in-place", as long as you have the necessary prerequisites available.
Required software:
-* Web server with PHP 5.2.x or higher.
+* Web server with PHP 5.3.2 or higher.
* A SQL server, the following types are supported
-** MySQL 4.0.14 or higher
+** MySQL 5.0.2 or higher
** PostgreSQL 8.3 or higher
-** SQLite
+** SQLite 3.3.7 or higher
+** Oracle 9.0.1 or higher
MediaWiki is developed and tested mainly on Unix/Linux platforms, but should
work on Windows as well.