Microsoft is steaming forward with the development of Windows Vista. Just last week the company released an interim build, 5536, to beta testers. Today, the company has uploaded Vista RC1 for testers to try out. RC1 is available for users running 32-bit processors as well as x86-64 processors.

You'll notice a lot of improvements since Beta 2. We've made some UI adjustments, added more device drivers, and enhanced performance. We're not done yet, however - quality will continue to improve. We'll keep plugging away on application compatibility, as well as fit and finish, until RTM. If you are an ISV, RC1 is the build you should use for certifying your application.

The operating system is in great shape with RC1, but there's still a lot of testing to do. You've come through for us so far, and I'm asking you to once again put the pedal to the metal and send us feedback. Windows Vista is going to touch hundreds of millions of lives all around the world. Thanks for everything you're doing to help us give them the best experience possible.