On October 25, 2007, Windows Vista earned the IPv6 Forum’s IPv6 Ready Phase 2 Logo from the IPv6 Consortium and University of New Hampshire - InterOperability Lab (UNH-IOL).
Vista earned its Phase 1 Logo, which focuses on interoperability of core protocols, and compliance to MUST statements in core RFCs back in March of 2007. Phase 2 Logo is a more rigorous examination which is focused on daily professional use of IPv6, and examines compliance to both MUST and SHOULD statements in a wider set of scenarios.
You can verify the Phase 1 logo status here, and the Phase 2 logo status here.
This is a great win for the team and once again shows that IPv6 is ready. Are you?