Zune's were very basic music and video players(I used to own one.) You can't say with a straight face that the user interface of the Zune had any great similarities to the User interface of a desktop OS.
OP was comparing touch interfaces, and used iPhone and Android as examples that were well ahead of MS and by how many years. I mentioned the Zune because it's a counterexample for the specific claim made by OP about the timing of Metro, specifically with respect to touch interfaces.
