Newer update: MSSQL is alive again

Update: with Drupal 4.4, MSSQL is not supported because we have no maintainer for this piece of the application. If you wish to update the database.mssql schema and get MSSQL working again, please send a note to the drupal-devel mail list.

The CVS version of Drupal has recently been enhanced such that Microsoft SQL Server (MSSQL) database joins MySQL and Postgres as a compatible database server.

Microsoft SQL Server is a very capable, reliable, and popular database platform. These recent Drupal enhancements welcome many more potential users - especially corporate/enterprise users. Windows-centric organizations may now run Drupal on IIS and SQL Server if they wish.

Installation instructions are in the Handbook.
---
At this point, MSSQL compatibility is lightly tested. Please do post bug reports in the Bug Tracker. Also, modules in the Contrib repository will often fail on MSSQL. Please notify module maintainers when you find these bugs. Even better, send them a patch!