Thank you for your interest in evaluating Windows Server 2003 R2 RC1. Windows Server 2003 R2 release candidate software is available to download for evaluation in both x64 and x86 versions. Windows Server 2003 R2 RC1 software cannot be installed on anything other than software versions of Windows Server 2003 with Service Pack 1 (SP1). Installing the RC1 software for Windows Server 2003 R2 does not extend the time that you can use the trial version of Windows Server 2003 SP1. The Windows Server 2003 R2 release candidate software is available for evaluation for 180 days.