1. Not like SSMS for database engine, you cannot connect to SQL Server 2008R2 reporting service using SSMS 2012. You will get an error: Report Server WMI Provider error: Invalid namespce (Microsoft.Sqlserver.Management.UI.RSClient). But it is fine to use SSMS 2008R2 to connect to the 2008R2 reporting services.
2. I cannot make SQL Server 2005 Reporting Services working, along with the other three higher versions. Although I am able to install reporting services for SQL Server 2005 (even start/stop the reporting services using SQL Server Configuration Manager), the Reporting Service Configuration Manager CANNOT be properly configured as shown below, despite it is theoretically possible according to http://msdn.microsoft.com/en-us/library/ms143736.aspx.
