Hi,
even if the name "Zune" is registered by the AROS team for the GUI, it is a registered name for a peace of software. The name is not registered for everything and so Microsoft could use the name for a peace of hardware.
If I like it I could open a company and name it Microsoft, if I have nothing to do with computers at all (maybe building "Microsoft Windows" and "Microsoft Doors" for your home :-D)
Noster