Actually, you are wrong. The RTM version could be anywhere from the 57xx series to the 59xx series. However, the build number of the final release will be MANUALLY changed to build 6000. So, technically, the RTM build number is 6000. In case anyone is still wondering, build 5717 is part of the RTM fork and was released recently to TAP testers. TAP will receive weekly builds until Vista is finalized. Despite reports, build 5717 will NOT be released to Connect. Nevertheless, TechBeta testers will still continue receive various builds. Vista, at this point, is expected to be finalized on October 25. However, this date is likely to change based on Microsoft's often unpredictable delays.