Shortly after news about Vista prices appeared on Amazon, Microsoft announces us that a RC1 is now available for testing.

This version of Vista is available for the time being only for their internal testers (TechBeta/TAP users) but a version will made available for MSDN and TechNet subscribers next week.

More details were posted on Platforms and Services Co-President Jim Allchin blog:

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.

This RC1 comes in two versions. One for 32-bit and one for 64-bit. We will probably have more news about Vista progress and this latest Vista build as soon as the testers will present their reports.