After downloading  & installing SQL Server 2008 RTM,  When you use SQL Server Management Studio and select the Help/About menu choice to see what version you have, you may see something like this:

 

Microsoft SQL Server Management Studio                        10.0.1600.22 ((SQL_PreRelease).080709-1414 )
Microsoft Analysis Services Client Tools                        2007.0100.1600.022 ((SQL_PreRelease).080709-1414 )
Microsoft Data Access Components (MDAC)                        6.0.6001.18000 (longhorn_rtm.080118-1840)
Microsoft MSXML                        3.0 5.0 6.0
Microsoft Internet Explorer                        8.0.6001.18241
Microsoft .NET Framework                        2.0.50727.3053
Operating System                        6.0.6001

 

Confusing?

how does RTM edition show up SQL_PreRelease version? 

Read on

http://blogs.msdn.com/psssql/archive/2008/08/18/is-it-really-the-released-version-of-sql-server-2008.aspx 

 

- Cheers.