With SQL Server 2000 reporting services, you can ONLY use VS2003 to design
VS2005 itself does not have BI project, unless you installed SQL Serer 2005
client tool. That is, SQL Server2005 comes with a srip-down version of
VS2005, only used for designing report of SQL Server2005 Reporting Services.
When you install SQL Server2005 client tool, while you already have a
version of VS2005 installed, the SQL Server2005 BI tool will be merged into
the existing VS installation. Since you do not have SQL Server2005, your
VS2005 cannot be used for designing SQL Server2005 report.
Also, you cannot use SQL Server2005 report desinger for SQL Server2000
reporting services. However, you can run reports designed from SQL
Server2000 in SQL Server2005 reporting services; you can also update the
reports from SQL Server2000 to SQL Server2005 Reporting Services with VS2005