This is a rather funny fact unless you’re the owner of a Zune, Microsoft‘s new digital media player. Somewhere between all support pages for the Zune and its software is a document that lists the compatible operating systems.
The page mentions that the Zune software suite, released after Windows Vista went RTM, is not compatible with Microsoft’s upcoming operating system. The unlucky are told to “check back soon for updates”.
Nice one, Microsoft! 
Bart says:
Allow me to point you back to the info page at zune.net which now states Zune is supported on Windows Vista, so no big problem for end-users who will only have Vista from January on.