Microsoft has released Windows Vista Service Pack 1 Release Candidate to the public. Windows Vista users can download the package and preview the software now. But remember it is a release candidate and not the final version.
It is important to note that this pre-release software is provided for testing purposes only. Windows Vista SP1 Release Candidate is time-limited software and will no longer operate after June 30, 2008 and should be uninstalled prior to that date. Moreover, when the final version of Windows Vista SP1 is released in first quarter of 2008, you will need to uninstall this pre-release code. Remember that you must have a genuine copy of Windows Vista installed. Also note that if you have a prior version of SP1 Beta installed, you must uninstall it prior to installing RC.
Download Windows Vista SP1 RC
Windows Vista Service Pack 1 RC contains changes focused on addressing specific reliability and performance issues, supporting new types of hardware, and adding support for several emerging standards. SP1 also will continue to make it easier for IT administrators to deploy and manage Windows Vista.
Download Windows Vista SP1 RC at MSDN or TechNet. Self-help and peer support is available via the Windows Vista SP1 forum and FAQ page.
UPDATE: You can now Download Windows Vista SP1 final release.