Deploying Office Communications Server 2007 R2 Enterprise Edition requires a separate installation of SQL Server to host the back-end database. For details, see the Deploying Office Communications Server 2007 R2 Enterprise Editiondocumentation.

Deploying Office Communications Server 2007 R2 Standard Edition will install SQL Server Express on the Standard Edition server. For details, see the Deploying Office Communications Server 2007 R2 Standard Editiondocumentation.

If you are deploying an Enterprise Edition pool, you will need to prepare a SQL server for the back-end database. For details on these tasks, see Configure SQL Server for Office Communications Serverin the Deploying Office Communications Server 2007 R2 Enterprise Edition documentation.