How to: Install Reporting Services Side-by-Side an Earlier Version: "Report definition (.rdl) files that you create in the SQL Server 2000 version of Report Designer can be published to either a SQL Server 2000 or SQL Server 2005 report server. If you publish a SQL Server 2000 .rdl file to a SQL Server 2005 report server, it will be converted and stored on the report server in the SQL Server 2005 format. If you open a SQL Server 2000 Reporting Services report in the SQL Server 2005 version of Report Designer, you will be prompted to upgrade it. For more information, see Upgrading Reports.

The Reporting Services Configuration tool cannot be used to configure a SQL Server 2000 report server. However, you can use Management Studio to connect to a SQL Server 2000 report server. Note that when you install different versions of Reporting Services, each report server installation has a corresponding Report Manager instance that can only be used with that installation. You can expect to see minor differences in the different versions of Report Manager."