http://blogs.msdn.com/b/jenss/archive/2009/04/11/sql-server-2008-sp1-cu1-or-cu4-or-what.aspxI saw some confusion around the availability and difference of SP1 and CU4 on the web, therefore decided to put on a blog post for clarifying this. If you compare the contents of CU4 (RTM) and SP1 for SQL Server 2008, you will notice that some patchesen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.msdn.com/b/jenss/archive/2009/04/11/sql-server-2008-sp1-cu1-or-cu4-or-what.aspx#9545072Sat, 11 Apr 2009 12:13:21 GMT91d46819-8472-40ad-a661-2c78acb4018c:9545072SQL Server 2008 SP1 + CU1 or CU4 or what ? | Coded Style<p>PingBack from <a rel="nofollow" target="_new" href="http://www.codedstyle.com/sql-server-2008-sp1-cu1-or-cu4-or-what/">http://www.codedstyle.com/sql-server-2008-sp1-cu1-or-cu4-or-what/</a></p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=9545072" width="1" height="1">http://blogs.msdn.com/b/jenss/archive/2009/04/11/sql-server-2008-sp1-cu1-or-cu4-or-what.aspx#9545071Sat, 11 Apr 2009 12:13:05 GMT91d46819-8472-40ad-a661-2c78acb4018c:9545071SQL Server 2008 SP1 + CU1 or CU4 or what ? | Coded Style<p>PingBack from <a rel="nofollow" target="_new" href="http://www.codedstyle.com/sql-server-2008-sp1-cu1-or-cu4-or-what-2/">http://www.codedstyle.com/sql-server-2008-sp1-cu1-or-cu4-or-what-2/</a></p> <img src="http://blogs.msdn.com/aggbug.aspx?PostID=9545071" width="1" height="1">