As what Mike Nash of the Windows Vista Team said, "I've personally been running Windows Vista SP1 pretty exclusively for a few months and I've noticed that my systems run faster and more reliably than they did with the "Gold" release of Windows Vista." So, customers who are currently using the Gold version will expect a lot on this upgrade made by Microsoft. As reported, this will be release in the mid-March.
Here's the timing for SP1 availability for current Windows Vista users:
* In mid-March, the team will release Windows Vista SP1 to Windows Update (in English, French, Spanish, German and Japanese) and to the download center on microsoft.com. Customers who visit Windows Update can choose to install Service Pack 1. If Windows Update determines that the system has one of the drivers the Vista team know to be problematic, then Windows Update will not offer SP1. Since the team know that some customers may want to update to SP1 anyhow, the download center will allow anyone who wants to install SP1 to do so.
* In mid-April, Vista team will begin delivering Windows Vista SP1 to Windows Vista customers who have chosen to have updates downloaded automatically. That said, any system that Windows Update determines has a driver known to not update successfully will not get SP1 automatically. As updates for these drivers become available, they will be installed automatically by Windows Update, which will unblock these systems from getting Service Pack 1. The result is that more and more systems will automatically get SP1, but only when the team are confident they will have a good experience.
* The remaining languages will RTM in April.
Original post: Windows Vista Team Blog