Windows Vista build 5061

Windows Vista build 5061 is a pre-Beta 1 build of Windows Vista, which is mentioned in the setup of build 5098, 5212 and 5219. In particular, it notes that you can only upgrade if running build 5061 or higher. On 29 April 2021, ReflectiaX shared a screenshot of this build from the TechEd 2005 session.